Apexite

A valid IMA mineral species

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Apexite

Apex Mine, Reese River Mining District, Lander County, Nevada, USA

Apexite

Apex Mine, Reese River Mining District, Lander County, Nevada, USA

Apexite

Apex Mine, Reese River Mining District, Lander County, Nevada, USA

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About ApexiteHide

Apex mine portal

Apex Mine, Reese River Mining District, Lander County, Nevada, USA

Formula:

NaMg(PO₄) · 9H₂O

Colour:

Colorless

Lustre:

Vitreous

Hardness:

Specific Gravity:

1.74

Crystal System:

Triclinic

Name:

Named after the type locality, the Apex mine, Nevada.

Type Locality:

ⓘ Apex Mine (Rundberg Mine; Early Day Mine), Reese River Mining District, Lander County, Nevada, USA

New structure type. Structurally related to hazenite (member of the struvite group).

Unique IdentifiersHide

Mindat ID:

46617

Long-form identifier:

mindat:1:1:46617:8

IMA Classification of ApexiteHide

IMA status:

Approved

IMA Formula:

NaMg(PO₄)·9H₂O

Approval year:

2015

First published:

2015

Type description reference:

Kampf, Anthony R., Mills, Stuart J., Nash, Barbara P., Jensen, Martin, Nikischer, Tony (2015) Apexite, NaMg(PO4)·9H2O, a new struvite-type phase with a heteropolyhedral cluster. American Mineralogist, 100 (11) 2695-2701 doi:10.2138/am-2015-5457

Classification of ApexiteHide

Strunz-mindat (2026):

8.CA.

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H₂O
A : With small and large/medium cations

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Ape	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of ApexiteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of ApexiteHide

Lustre:

Vitreous

Transparency:

Transparent

Comment:

Crystals have vitreous to satiny luster.

Colour:

Colorless

Streak:

White

Hardness:

2 on Mohs scale

Comment:

about 2

Tenacity:

Brittle

Cleavage:

Perfect
One perfect cleavage on {100}.

Comment:

Fracture is curved

Density:

1.74(1) g/cm³ (Measured) 1.741 g/cm³ (Calculated)

Optical Data of ApexiteHide

Type:

Biaxial (+/-)

RI values:

n_α = 1.475(1) n_β = 1.481(1) n_γ = 1.487(1)

2V:

Measured: 88.5° (3), Calculated: 90°

Max. Birefringence:

δ = 0.012
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

Thickness: 30 µm

Stage rotation: 0°

Chemistry of ApexiteHide

Mindat Formula:

NaMg(PO₄) · 9H₂O

Element Weights:

Element	% weight
O	68.328 %
P	10.175 %
Mg	7.985 %
Na	7.552 %
H	5.960 %

Calculated from ideal end-member formula.

Elements listed:

H, Mg, Na, O, P - search for minerals with similar chemistry

Crystallography of ApexiteHide

Crystal System:

Triclinic

Class (H-M):

1 - Pinacoidal

Space Group:

Setting:

Cell Parameters:

a = 6.9296(7) Å, b = 11.977(1) Å, c = 14.944(2) Å
α = 92.109(6)°, β = 102.884(7)°, γ = 105.171(7)°

Ratio:

a:b:c = 0.579 : 1 : 1.248

Unit Cell V:

1160.9 Å³

Morphology:

Needles up to 0.5 mm in length

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0020383	Apexite	Kampf A R, Mills S J, Nash B P, Jensen M, Nikischer T (2015) Apexite, NaMg(PO4)9H2O, a new struvite-type phase with a heteropolyhedral cluster* American Mineralogist 100 2695-2701		2015	Apex mine, Lander County, Nevada, USA	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Apexite'
loop_
_publ_author_name
'Kampf A R'
'Mills S J'
'Nash B P'
'Jensen M'
'Nikischer T'
_journal_name_full 'American Mineralogist'
_journal_volume 100 
_journal_year 2015
_journal_page_first 2695
_journal_page_last 2701
_publ_section_title
;
 Apexite, NaMg(PO4)*9H2O, a new struvite-type phase with a heteropolyhedral cluster
;
_database_code_amcsd 0020383
_chemical_compound_source 'Apex mine, Lander County, Nevada, USA'
_chemical_formula_sum 'Na.91 Mg1.09 P O13 H18'
_cell_length_a 6.9296
_cell_length_b 11.9767
_cell_length_c 14.9436
_cell_angle_alpha 92.109
_cell_angle_beta 102.884
_cell_angle_gamma 105.171
_cell_volume 1160.883
_exptl_crystal_density_diffrn      1.742
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na1   0.75380   0.00280   0.99880   0.91000   0.03900
Mg1   0.75380   0.00280   0.99880   0.09000   0.03900
Na2   0.98960   0.40030   0.58450   0.91000   0.03380
Mg2   0.98960   0.40030   0.58450   0.09000   0.03380
Mg3   0.85280   0.11630   0.60609   1.00000   0.02280
Mg4   0.20120   0.58290   0.79178   1.00000   0.02450
P1   0.70510   0.73255   0.66342   1.00000   0.01870
P2   0.48590   0.24050   0.76778   1.00000   0.02090
O1   0.52960   0.78630   0.62690   1.00000   0.02420
O2   0.89350   0.78560   0.62440   1.00000   0.02640
O3   0.62950   0.59920   0.63700   1.00000   0.02390
O4   0.77350   0.75650   0.77050   1.00000   0.02910
O5   0.43290   0.10760   0.76400   1.00000   0.02720
O6   0.34810   0.28500   0.81970   1.00000   0.03150
O7   0.44930   0.27870   0.66950   1.00000   0.03130
O8   0.71450   0.29640   0.81810   1.00000   0.02440
OW9   0.95740   0.22190   0.72560   1.00000   0.04080
H9A   0.08500   0.24200   0.76100   1.00000   0.06100
H9B   0.87700   0.23700   0.76100   1.00000   0.06100
OW10   0.74780   0.00780   0.48700   1.00000   0.03410
H10A   0.63000   0.00100   0.44600   1.00000   0.05100
H10B   0.82400  -0.02100   0.45500   1.00000   0.05100
OW11   0.61220   0.01500   0.65180   1.00000   0.03150
H11A   0.58400  -0.06100   0.65100   1.00000   0.04700
H11B   0.55800   0.04200   0.69400   1.00000   0.04700
OW12   0.04620   0.01410   0.65500   1.00000   0.03170
H12A   0.00300  -0.06200   0.65200   1.00000   0.04800
H12B   0.16500   0.04100   0.69200   1.00000   0.04800
OW13   0.08590   0.22360   0.55500   1.00000   0.02780
H13A   0.09700   0.21300   0.49800   1.00000   0.04200
H13B   0.21100   0.24000   0.59200   1.00000   0.04200
OW14   0.67260   0.22730   0.55640   1.00000   0.03030
H14A   0.60100   0.22400   0.49900   1.00000   0.04500
H14B   0.59400   0.24200   0.59300   1.00000   0.04500
OW15   0.20590   0.70140   0.69870   1.00000   0.05410
H15A   0.31200   0.72800   0.67400   1.00000   0.08100
H15B   0.10200   0.72400   0.66700   1.00000   0.08100
OW16   0.21020   0.45990   0.88420   1.00000   0.03660
H16A   0.27200   0.40700   0.87700   1.00000   0.05500
H16B   0.20600   0.47000   0.94200   1.00000   0.05500
OW17   0.94050   0.33150   0.13180   1.00000   0.03700
H17A   0.04900   0.31200   0.16600   1.00000   0.05500
H17B   0.89100   0.28000   0.08200   1.00000   0.05500
OW18   0.31720   0.48550   0.70950   1.00000   0.02610
H18A   0.36000   0.42200   0.72300   1.00000   0.03900
H18B   0.41300   0.52500   0.68000   1.00000   0.03900
OW19   0.50360   0.66500   0.86340   1.00000   0.04660
H19A   0.58900   0.67100   0.82500   1.00000   0.07000
H19B   0.51500   0.74000   0.87800   1.00000   0.07000
OW20   0.90060   0.48370   0.72120   1.00000   0.02750
H20A   0.84200   0.43500   0.75600   1.00000   0.04100
H20B   0.80500   0.51400   0.69100   1.00000   0.04100
OW21   0.71990  -0.19400   0.02420   1.00000   0.03720
H21A   0.84100  -0.20900   0.03800   1.00000   0.05600
H21B   0.67000  -0.21600   0.07300   1.00000   0.05600
OW22   0.86930   0.20000   0.96910   1.00000   0.03430
H22A   0.84200   0.24300   0.92300   1.00000   0.05100
H22B   0.00000   0.21300   0.98700   1.00000   0.05100
OW23   0.57660   0.04840   0.11050   1.00000   0.04030
H23A   0.64000   0.11400   0.14800   1.00000   0.06000
H23B   0.56200  -0.00700   0.14900   1.00000   0.06000
OW24   0.92680  -0.03270   0.87720   1.00000   0.04190
H24A   0.89200  -0.10100   0.84200   1.00000   0.06300
H24B   0.92200   0.02000   0.83600   1.00000   0.06300
OW25   0.76610   0.50040   0.50140   1.00000   0.03280
H25A   0.64600   0.46800   0.46100   1.00000   0.04900
H25B   0.73000   0.54000   0.54400   1.00000   0.04900
OW26   0.25750   0.49810   0.07300   1.00000   0.03990
H26A   0.29100   0.57000   0.10000   1.00000   0.06000
H26B   0.15200   0.45700   0.09200   1.00000   0.06000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na1 0.03780 0.03600 0.04300 0.00980 0.00950 0.00260
Mg1 0.03780 0.03600 0.04300 0.00980 0.00950 0.00260
Na2 0.03170 0.03270 0.03700 0.01140 0.00700 0.00050
Mg2 0.03170 0.03270 0.03700 0.01140 0.00700 0.00050
Mg3 0.02150 0.02380 0.02110 0.00420 0.00390 0.00080
Mg4 0.02350 0.02470 0.02620 0.00610 0.00790 0.00510
P1 0.01740 0.02080 0.01900 0.00690 0.00460 0.00110
P2 0.01740 0.02140 0.02240 0.00380 0.00360 0.00100
O1 0.02300 0.02600 0.02800 0.01500 0.00500 0.00400
O2 0.02600 0.02700 0.02700 0.00800 0.00800 0.00300
O3 0.03000 0.01600 0.02400 0.00500 0.00600 -0.00400
O4 0.03000 0.03300 0.02400 0.00700 0.00600 0.00100
O5 0.03300 0.02100 0.02500 0.00400 0.00700 -0.00200
O6 0.02200 0.03600 0.03800 0.01100 0.00800 -0.00600
O7 0.02900 0.03900 0.02200 0.00500 0.00200 0.00900
O8 0.01900 0.02500 0.02800 0.00400 0.00400 0.00400
OW9 0.02300 0.05500 0.03800 0.01100 -0.00100 -0.02500
OW10 0.02400 0.04600 0.02900 0.01200 0.00000 -0.01700
OW11 0.03600 0.02100 0.04200 0.00800 0.02000 0.00000
OW12 0.02700 0.01700 0.04500 0.00100 0.00000 0.00400
OW13 0.02200 0.03900 0.02100 0.00500 0.00700 0.00700
OW14 0.02900 0.03900 0.02500 0.01500 0.00400 0.00500
OW15 0.03800 0.06500 0.08200 0.02900 0.03500 0.05600
OW16 0.05100 0.04000 0.02600 0.02100 0.01300 0.00700
OW17 0.03600 0.04300 0.03000 0.01500 0.00100 -0.00700
OW18 0.03100 0.01700 0.03500 0.01400 0.01000 0.01200
OW19 0.03800 0.05300 0.03600 -0.00800 0.01200 -0.01500
OW20 0.02400 0.03500 0.02500 0.01000 0.00600 0.01200
OW21 0.03800 0.04400 0.03200 0.01400 0.01000 0.00400
OW22 0.03900 0.03700 0.02700 0.01600 0.00100 0.00500
OW23 0.04800 0.03300 0.03700 0.00800 0.00800 0.01000
OW24 0.04900 0.03600 0.03300 0.00500 0.00400 -0.00800
OW25 0.02900 0.04100 0.02900 0.01400 0.00400 -0.00600
OW26 0.05000 0.03200 0.03400 0.00300 0.01400 0.00100

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
14.63 Å	(35)
5.11 Å	(61)
4.68 Å	(75)
4.301 Å	(96)
4.008 Å	(44)
2.876 Å	(46)
2.762 Å	(100)
2.507 Å	(30)

Locality:

Apex Mine (Rundberg Mine; Early Day Mine), Reese River Mining District, Lander County, Nevada, USA

Reference:

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47c : [Carbonates, phosphates, borates, nitrates]
Stage 10b: Anthropogenic minerals	<10 Ka
55 : Anthropogenic mine minerals

Type Occurrence of ApexiteHide

Type Locality:

ⓘ Apex Mine (Rundberg Mine; Early Day Mine), Reese River Mining District, Lander County, Nevada, USA

General Appearance of Type Material:

A low-temperature secondary mineral on massive quartz matrix.

Place of Conservation of Type Material:

Co-type material is deposited in the collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 65563 and 65564, and the Museum Victoria, Melbourne, Victoria, Australia, catalog

Associated Minerals at Type Locality:

Andersonite	Calcite	Čejkaite	Gaylussite	Goethite
Quartz

Reference:

Synonyms of ApexiteHide

IMA2015-002

Other Language Names for ApexiteHide

Dutch:Apexiet

French:Apexite

German:Apexit

Norwegian:Apexitt

Common AssociatesHide

Associations Based on Photo Data:

3 photos of Apexite associated with Čejkaite

Na₄(UO₂)(CO₃)₃

Related Minerals - Strunz-mindat Grouping Hide

8.CA.	Brandãoite	BeAl₂(PO₄)₂(OH)₂(H₂O)₅	Tric. 1 : P1
8.CA.	Davidlloydite	Zn₃(AsO₄)₂ · 4H₂O	Tric. 1 : P1
8.CA.05	Parafransoletite	Ca₃Be₂(PO₄)₂(PO₃OH)₂ · 4H₂O	Tric. 1 : P1
8.CA.05	Fransoletite	Ca₃Be₂(PO₄)₂(PO₃OH)₂ · 4H₂O	Mon. 2/m : P2₁/c
8.CA.10	Ehrleite	Ca₄Be₃Zn₂(PO₄)₆ · 9H₂O	Tric. 1 : P1
8.CA.15	Faheyite	Be₂Mn²⁺Fe³⁺₂(PO₄)₄ · 6H₂O	Trig. 32 : P3₁21
8.CA.20	Mccrillisite	NaCs(Be,Li)Zr₂(PO₄)₄ · 1-2H₂O	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
8.CA.20	Gainesite	Na(Na,K)(Be,Li)Zr₂(PO₄)₄ · 1.5-2H₂O	Tet. 4mm : I4₁md
8.CA.20	Selwynite	NaK(Be,Al)Zr₂(PO₄)₄ · 2H₂O	Tet. 4/mmm(4/m2/m2/m) : I4₁/amd
8.CA.25	Pahasapaite	Li₈(Ca,Li,K)_10.5Be₂₄(PO₄)₂₄ · 38H₂O	Iso. 23 : I23
8.CA.30	Nizamoffite	Mn²⁺Zn₂(PO₄)₂(H₂O)₄	Orth. mmm(2/m2/m2/m) : Pbcm
8.CA.30	Arsenohopeite	Zn₃(AsO₄)₂ · 4H₂O	Orth. mmm(2/m2/m2/m) : Pnma
8.CA.30	Hopeite	ZnZn₂(PO₄)₂ · 4H₂O	Orth. mmm(2/m2/m2/m) : Pnma
8.CA.35	Warikahnite	Zn₃(AsO₄)₂ · 2H₂O	Tric. 1 : P1
8.CA.40	Phosphophyllite	Zn₂Fe ²⁺(PO₄)₂ · 4H₂O	Mon. 2/m : P2₁/c
8.CA.42	Steinmetzite	Zn₂Fe³⁺(PO₄)₂(OH) · 3H₂O	Tric. 1 : P1
8.CA.45	Parascholzite	CaZn₂(PO₄)₂ · 2H₂O	Mon.
8.CA.45	Scholzite	CaZn₂(PO₄)₂ · 2H₂O	Orth. mmm(2/m2/m2/m) : Pbcm
8.CA.50	Keyite	Cu²⁺₃Zn₄Cd₂(AsO₄)₆ · 2H₂O	Mon. 2/m : B2/b
8.CA.55	Pushcharovskite	K_0.6Cu₁₈[AsO₂(OH)₂]₄[AsO₃OH]₁₀(AsO₄)(OH)_9.6 · 18.6H₂O	Tric.
8.CA.60	Prosperite	Ca₂Zn₄(AsO₄)₄ · H₂O	Mon.
8.CA.65	Gengenbachite	KFe³⁺₃(PO₃OH)₄[PO₂(OH)₂]₂ · 6H₂O	Trig. 3m : P31c
8.CA.70	Parahopeite	Zn₃(PO₄)₂ · 4H₂O	Tric. 1 : P1
8.CA.70	Reaphookhillite	MgZn₂(PO₄)₂ · 4H₂O	Tric. 1 : P1
8.CA.75	Stergiouite	CaZn₂(AsO₄)₂ · 4H₂O	Mon. m : Pb
8.CA.80	Limousinite	BaCa[Be₄P₄O₁₆] · 6H₂O	Mon. 2/m : P2₁/c
8.CA.85	Minjiangite	BaBe₂(PO₄)₂	Hex. 6/mmm(6/m2/m2/m) : P6/mmm
8.CA.85	Wilancookite	(Ba₅Li₂◻)Ba₆Be₂₄P₂₄O₉₆ · 26H₂O	Iso. 23 : I23

Other InformationHide

Notes:

slowly soluble in water

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ApexiteHide

mindat.org URL:

https://www.mindat.org/min-46617.html
Please feel free to link to this page.

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Look for Apexite in the Rock H. Currier Digital Library

External Links:

Look for Apexite on Webmineral

Look for Apexite on Wikipedia

Look for Apexite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for ApexiteHide

Reference List:

(revised 2017) http://www.handbookofmineralogy.com/pdfs/apexite.pdf (for optical properties and solubility)

Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 25. Mineralogical Magazine, 79 (3) 529-535 doi:10.1180/minmag.2015.079.3.02

(2017) Apexite. Handbook of Mineralogy. Mineralogical Society of America

Localities for ApexiteHide

Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

USA (TL)

Nevada

Lander County

Reese River Mining District

ⓘ Apex Mine (Rundberg Mine; Early Day Mine) (TL)

Mineralogical Magazine +2 other references

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Apexite

About ApexiteHide

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Optical Data of ApexiteHide

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Related Minerals - Strunz-mindat GroupingHide

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Related Minerals - Strunz-mindat Grouping Hide