Oval-shaped complex of 2 x 1.5 km with an area of fenites up to a kilometre wide extending around the eastern margin; there is a little exposure to the west.
Together with nearby intrusions of Chiuerinde Intrusion, Camacuio, Namibe Province, Angola and Lutala Complex, Camacuio, Namibe Province, Angola, have been referred to as Serra da Neve (Pereira & Moreira 1977).

Nejoio forms a small subvolcanic ring complex of ijolites and feldspathoidal syenites, surrounded by a 200 m wide fenite zone. The complex comprises an inner zone of amphibole and pyroxene ijolite mixed with more syenitic varieties. The outer zone nepheline syenites contain abundant feldspar, nepheline, sodalite and cancrinite, with minor pyroxene, magnetite, pyrochlore and pyrophanite-ilmenite series, as well as numerous accessory minerals including zircon, sphalerite and rutile.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

31 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine

Formula: NaFe³⁺Si₂O₆

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

Borst, Anouk M, Finch, Adrian A, Siegfried, Peter Roy, Bambi, Aurora (2023) Mixing, mingling and metasomatism: Late-stage HFSE mobility and carbothermal alteration in the Nejoio alkaline silicate complex, Angola. Goldschmidt 2023 Conference, GOLDSCHMIDT.

ⓘ Aegirine-augite

Formula: (Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Alkali Feldspar'

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Andradite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Andradite var. Melanite

Formula: Ca₃Fe³⁺₂(SiO₄)₃

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Apatite'

Formula: Ca₅(PO₄)₃(Cl/F/OH)

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Burbankite

Formula: (Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅

References:

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ Cancrinite

Formula: (Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Carbocernaite

Formula: (Ca,Na)(Sr,Ce,Ba)(CO₃)₂

References:

ⓘ Catapleiite

Formula: Na₂Zr(Si₃O₉) · 2H₂O

References:

Borst, A.M., Finch, A.A., Nielson, G., Siegfried, P.R., Lopes, E., Eugenio, A. and Bambi, A.C.J.M. (2021) Alkaline magmatism and critical metals in Angola: Field observations and petrography of the Nejoio nepheline syenite complex. Pp. 30–31 in: Geologica Belgica. Africa Museum, Tervuren

ⓘ Dawsonite

Formula: NaAlCO₃(OH)₂

References:

ⓘ Diopside

Formula: CaMgSi₂O₆

References:

ⓘ Dolomite

Formula: CaMg(CO₃)₂

References:

ⓘ Eckermannite

Formula: NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Eudialyte

Formula: Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Feldspar Group'

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Feldspathoid'

References:

ⓘ Fluorite

Formula: CaF₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Hedenbergite

Formula: CaFe²⁺Si₂O₆

References:

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

ⓘ Låvenite

Formula: Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Magnesio-arfvedsonite

Formula: {Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Mosandrite-(Ce)

Formula: (Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Nepheline

Formula: Na₃K(Al₄Si₄O₁₆)

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Pyrite

Formula: FeS₂

References:

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Pyrophanite

Formula: Mn²⁺TiO₃

References:

ⓘ 'Pyroxene Group'

Formula: ADSi₂O₆

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Quartz

Formula: SiO₂

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ 'Rhombohedral Carbonate'

Formula: (Ca/Mg/Fe/Mn etc)CO₃

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Rosenbuschite

Formula: Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Rutile

Formula: TiO₂

References:

ⓘ Sodalite

Formula: Na₄(Si₃Al₃)O₁₂Cl

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Sphalerite

Formula: ZnS

References:

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Pyrophanite	4.CB.05	Mn²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Rutile	4.DB.05	TiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
ⓘ	Carbocernaite	5.AB.50	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
ⓘ	Burbankite	5.AC.30	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
ⓘ	Dawsonite	5.BB.10	NaAlCO₃(OH)₂
Group 9 - Silicates
ⓘ	Andradite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	var. Melanite	9.AD.25	Ca₃Fe³⁺₂(SiO₄)₃
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Låvenite	9.BE.17	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
ⓘ	Mosandrite-(Ce)	9.BE.20	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
ⓘ	Rosenbuschite	9.BE.22	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
ⓘ	Catapleiite	9.CA.15	Na₂Zr(Si₃O₉) · 2H₂O
ⓘ	Eudialyte	9.CO.10	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Hedenbergite	9.DA.15	CaFe²⁺Si₂O₆
ⓘ	Aegirine-augite	9.DA.20	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆
ⓘ	Aegirine	9.DA.25	NaFe³⁺Si₂O₆
ⓘ	Eckermannite	9.DE.25	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
ⓘ	Magnesio-arfvedsonite	9.DE.25	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
ⓘ	Nepheline	9.FA.05	Na₃K(Al₄Si₄O₁₆)
ⓘ	Cancrinite	9.FB.05	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
ⓘ	Sodalite	9.FB.10	Na₄(Si₃Al₃)O₁₂Cl
Unclassified
ⓘ	'Alkali Feldspar'	-
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Feldspar Group'	-
ⓘ	'Hornblende Root Name Group'	-	◻Ca₂(Z²⁺₄Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'Pyroxene Group'	-	ADSi₂O₆
ⓘ	'Apatite'	-	Ca₅(PO₄)₃(Cl/F/OH)
ⓘ	'Feldspathoid'	-
ⓘ	'Rhombohedral Carbonate'	-	(Ca/Mg/Fe/Mn etc)CO₃

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
H	ⓘ Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O
H	ⓘ Dawsonite	NaAlCO₃(OH)₂
H	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
H	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
H	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
H	ⓘ Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
H	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
C	Carbon
C	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
C	ⓘ Calcite	CaCO₃
C	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
C	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
C	ⓘ Dawsonite	NaAlCO₃(OH)₂
C	ⓘ Dolomite	CaMg(CO₃)₂
C	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
O	Oxygen
O	ⓘ Aegirine	NaFe³⁺Si₂O₆
O	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
O	ⓘ Calcite	CaCO₃
O	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
O	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
O	ⓘ Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O
O	ⓘ Dawsonite	NaAlCO₃(OH)₂
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
O	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
O	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
O	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
O	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Pyrophanite	Mn²⁺TiO₃
O	ⓘ Quartz	SiO₂
O	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
O	ⓘ Rutile	TiO₂
O	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
O	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Pyroxene Group	ADSi₂O₆
O	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
O	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
F	ⓘ Fluorite	CaF₂
F	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
F	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
F	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
F	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Na	Sodium
Na	ⓘ Aegirine	NaFe³⁺Si₂O₆
Na	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Na	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
Na	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Na	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
Na	ⓘ Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O
Na	ⓘ Dawsonite	NaAlCO₃(OH)₂
Na	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
Na	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Na	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
Na	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
Na	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Na	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
Na	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Mg	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
Mg	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
Mg	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Al	Aluminium
Al	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Al	ⓘ Dawsonite	NaAlCO₃(OH)₂
Al	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
Al	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Al	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Al	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	Silicon
Si	ⓘ Aegirine	NaFe³⁺Si₂O₆
Si	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Si	ⓘ Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Eckermannite	NaNa₂(Mg₄Al}Si₈O₂₂(OH)₂
Si	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Si	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Si	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
Si	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
Si	ⓘ Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
Si	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
Si	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Zircon	Zr(SiO₄)
Si	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Si	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Pyroxene Group	ADSi₂O₆
P	Phosphorus
P	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
S	Sulfur
S	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
S	ⓘ Pyrite	FeS₂
S	ⓘ Sphalerite	ZnS
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Cl	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Cl	ⓘ Sodalite	Na₄(Si₃Al₃)O₁₂Cl
Cl	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Cl	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Nepheline	Na₃K(Al₄Si₄O₁₆)
Ca	Calcium
Ca	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Ca	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Cancrinite	(Na,Ca,◻)₈(Al₆Si₆O₂₄)(CO₃,SO₄)₂ · 2H₂O
Ca	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Ca	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
Ca	ⓘ Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
Ca	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Ca	ⓘ Hornblende Root Name Group	◻Ca₂(Z₄²⁺Z³⁺)(AlSi₇O₂₂)(OH,F,Cl)₂
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Ca	ⓘ Apatite	Ca₅(PO₄)₃(Cl/F/OH)
Ca	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Ti	ⓘ Mosandrite-(Ce)	(Ca₃REE)[(H₂O)₂Ca_0.5◻_0.5]Ti(Si₂O₇)₂(OH)₂(H₂O)₂
Ti	ⓘ Pyrophanite	Mn²⁺TiO₃
Ti	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
Ti	ⓘ Rutile	TiO₂
Ti	ⓘ Titanite	CaTi(SiO₄)O
Mn	Manganese
Mn	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
Mn	ⓘ Pyrophanite	Mn²⁺TiO₃
Mn	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Fe	Iron
Fe	ⓘ Aegirine	NaFe³⁺Si₂O₆
Fe	ⓘ Aegirine-augite	(Na_aCa_bFe_c²⁺Mg_d)(Fe_e³⁺Al_fFe_g²⁺Mg_h)Si₂O₆
Fe	ⓘ Andradite	Ca₃Fe₂³⁺(SiO₄)₃
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Fe	ⓘ Hedenbergite	CaFe²⁺Si₂O₆
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Magnesio-arfvedsonite	{Na}{Na₂}{Mg₄Fe³⁺}(Si₈O₂₂)(OH)₂
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Andradite var. Melanite	Ca₃Fe₂³⁺(SiO₄)₃
Fe	ⓘ Rhombohedral Carbonate	(Ca/Mg/Fe/Mn etc)CO₃
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Sr	Strontium
Sr	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
Sr	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
Zr	Zirconium
Zr	ⓘ Catapleiite	Na₂Zr(Si₃O₉) · 2H₂O
Zr	ⓘ Eudialyte	Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
Zr	ⓘ Låvenite	Na₂Ca₂Mn₂Zr₂(Si₂O₇)₂O₂F₂
Zr	ⓘ Rosenbuschite	Na₆Ca₆Zr₃Ti(Si₂O₇)₄O₂F₆
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Ba	Barium
Ba	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
Ba	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂
Ce	Cerium
Ce	ⓘ Burbankite	(Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅
Ce	ⓘ Carbocernaite	(Ca,Na)(Sr,Ce,Ba)(CO₃)₂

Geochronology

Mineralization age: Early/Lower Cretaceous : 104.3 ± 0.8 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic Time

Rocks, Minerals and Events

Phanerozoic

Mesozoic

Cretaceous

Early/Lower Cretaceous

ⓘ Biotite	104.3 ± 0.8 Ma
ⓘ Feldspar Group	104.3 ± 0.8 Ma

Other Regions, Features and Areas containing this locality

AfricaContinent

African PlateTectonic Plate

Congo Craton
- Angolan ShieldShield

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Rodrigues, B. 1978. Processos de evolucao magmatica no complexo alcalino do Nejoio. Boletim do Museo e Laboratorio Mineralogico e Geologico da Faculdade de Ciencias, Universidade de Lisboa, 15.

Allsopp, H. L., & Hargraves, R. B. (1985). Rb-Sr ages and palaeomagnetic data for some Angolan alkaline intrusives. Transactions of the Geological Society of South Africa, 88(2), 295-299.

Woolley, A. R. (2001) Alkaline Rocks and Carbonatites of the World, Part 3: Africa - Alkaline Rocks and Carbonatites of the World. The Geological Society of London.p.19

[1]Borst, Anouk M, Finch, Adrian A, Siegfried, Peter Roy, Bambi, Aurora (2023) Mixing, mingling and metasomatism: Late-stage HFSE mobility and carbothermal alteration in the Nejoio alkaline silicate complex, Angola. Goldschmidt 2023 Conference, GOLDSCHMIDT.

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Nejoio Complex, Camacuio, Namibe Province, AngolaiRegional Level TypesNejoio ComplexVolcanic Complex CamacuioMunicipality Namibe ProvinceProvince AngolaCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Detailed Mineral List:

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Geochronology

Other Regions, Features and Areas containing this locality

References

Nejoio Complex, Camacuio, Namibe Province, Angola i
Regional Level Types
Nejoio Complex Volcanic Complex
Camacuio Municipality
Namibe Province Province
Angola Country