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Ferri-obertiite
A valid IMA mineral species
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About Ferri-obertiite
Roberta Oberti
Formula:
NaNa2(Mg3Fe3+Ti)Si8O22O2
Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
Colour:
Pink-orange
Lustre:
Vitreous
Specific Gravity:
3.145 (Calculated)
Crystal System:
Monoclinic
Name:
The obertiite root name is for Prof. Roberta Oberti (born 1952 in Milan, Italy), University of Pavia, Italy, for her contributions to the crystal chemistry of amphiboles.
Ferri-obertiite is a rare sodic oxo-amphibole belonging to the obertiite root-name group. It is described from volcanic environments in the Eifel region (Vulkaneifel, Rhineland-Palatinate, Germany), where it occurs in vugs in volcanic rocks. and from miarolitic cavities in alkaline dikes in Stoutameyer Branch (Stotameyer Creek), West Augusta, Augusta County, Virginia, USA .
Accurate identification of ferri-obertiite requires determination of H and F contents, as well as the valence states of both Fe and Mn. For collector and locality use, material of this type may therefore be best labelled as “obertiite root-name amphibole” unless the analytical basis is complete.
Data provided by Günter Blaß show a wide range of Fe/Mn ratios in the obertiite root name minerals from the Eifel area, see Obertiite Root Name Group
Accurate identification of ferri-obertiite requires determination of H and F contents, as well as the valence states of both Fe and Mn. For collector and locality use, material of this type may therefore be best labelled as “obertiite root-name amphibole” unless the analytical basis is complete.
Data provided by Günter Blaß show a wide range of Fe/Mn ratios in the obertiite root name minerals from the Eifel area, see Obertiite Root Name Group
Unique Identifiers
Mindat ID:
46414
Long-form identifier:
mindat:1:1:46414:3
Similar Names
IMA Classification of Ferri-obertiite
Approved
IMA Formula:
NaNa2(Mg3Fe3+Ti4+)Si8O22O2
Approval year:
2015
First published:
2017
Approval history:
The obertiite root name mineral published as obertiite (IMA 1998-046) was renamed ferri-obertiite in 2012. Re-investigation of the holotype material in 2014 revealed that Mn3+ > Fe3+, hence this mineral was renamed to mangani-obertiite. Ferri-obertiite was formally approved as a new mineral by IMA in 2015 (IMA 2015-079).
Type description reference:
Oberti, Roberta, Boiocchi, Massimo, Hawthorne, Frank C., Ball, Neil A., Blass, Günter (2017) Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex, Germany: mineral data and crystal chemistry of a new amphibole end-member. Mineralogical Magazine, 81 (3) 641-651 doi:10.1180/minmag.2016.080.117
Classification of Ferri-obertiite
9.DE.25
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
Mineral Symbols
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 |
|---|---|---|
| Fob | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ferri-obertiite
Vitreous
Transparency:
Transparent
Colour:
Pink-orange
Tenacity:
Brittle
Cleavage:
Perfect
Perfect cleavage parallel to {110}.
Perfect cleavage parallel to {110}.
Density:
3.145 g/cm3 (Calculated)
Optical Data of Ferri-obertiite
Type:
Biaxial (+)
RI values:
nα = 1.664 nβ = 1.680 nγ = 1.722
2V:
Measured: 66.4° (3), Calculated: 64.7°
Max. Birefringence:
δ = 0.058
Based on recorded range of RI values above.
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.
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.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
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.
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.
Optical Extinction:
X = b; Y ∧ c = 17.8° (β obtuse); Z ∧ a = 3.5° (in β acute).
Pleochroism:
Visible
Comments:
X = pale pink; Y = pinkish orange; Z = orange brown.
Comments:
Absorption: X < Y < Z.
Chemistry of Ferri-obertiite
Mindat Formula:
NaNa2(Mg3Fe3+Ti)Si8O22O2
Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
Element Weights:
Crystallography of Ferri-obertiite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.7901(7) Å, b = 17.935(1) Å, c = 5.2892(4) Å
β = 104.142(2)°
β = 104.142(2)°
Ratio:
a:b:c = 0.546 : 1 : 0.295
Unit Cell V:
900.58 ų
Z:
2
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0002347 | Ferri-obertiite | Hawthorne F C, Cooper M A, Grice J D, Ottolini L (2000) A new anhydrous amphibole from the Eifel region, Germany: Description and crystal structure of obertiite, NaNa2(Mg3FeTi)Si8O22O2 American Mineralogist 85 236-241 |  | 2000 | Eifel region, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.391 Å | (72) |
| 3.388 Å | (72) |
| 3.260 Å | (37) |
| 3.116 Å | (76) |
| 2.704 Å | (100) |
| 2.583 Å | (39) |
| 2.529 Å | (67) |
| 2.160 Å | (39) |
Comments:
Rothenberg, Rhineland-Palatinate, Germany. The data are from Oberti et al. 2017.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 10 : Basalt-hosted zeolite minerals |
Type Occurrence of Ferri-obertiite
General Appearance of Type Material:
Acicular crystals of typical size 40 x 40 x 300 μm.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Mineralogia, Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, catalogue number 2015–02.
Empirical Formula of Type Material:
A(Na0.76K0.22)Σ0.98B(Na1.61Ca0.35Mn2+0.04)Σ2.00C(Mg3.58Mn2+0.11Fe3+0.62Ti4+0.66Cr3+0.01Zn0.01Ni0.01)Σ5.00T(Si7.82Ti4+0.12Al0.06)Σ8.00O22W[O1.26F0.55(OH)0.19]Σ2.00
Chemical Analysis of Type Material:
| SiO2 | 55.32 % |
|---|---|
| TiO2 | 7.31 % |
| Al2O3 | 0.34 % |
| Cr2O3 | 0.12 % |
| Fe2O3 | 5.81 % |
| FeO | 0.04 % |
| MnO | 1.32 % |
| MgO | 17.00 % |
| ZnO | 0.05 % |
| NiO | 0.04 % |
| CaO | 2.31 % |
| Na2O | 8.62 % |
| K2O | 1.24 % |
| H2O | 0.2 % |
| F | 1.22 % |
| Cl | 0.01 % |
| O=F | -0.52 % |
| Total: | 100.43 % |
Geological Setting of Type Material:
In vesicles in pale beige silicate veins within a green-yellow scoria found from a basalt quarry.
Associated Minerals at Type Locality:
Reference:
Oberti, Roberta, Boiocchi, Massimo, Hawthorne, Frank C., Ball, Neil A., Blass, Günter (2017) Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex, Germany: mineral data and crystal chemistry of a new amphibole end-member. Mineralogical Magazine, 81 (3) 641-651 doi:10.1180/minmag.2016.080.117
Synonyms of Ferri-obertiite
Other Language Names for Ferri-obertiite
Dutch:Ferri-obertiiet
German:Ferri-Obertiit
Relationship of Ferri-obertiite to other Species
Other Members of Obertiite Root Name Group:
| Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 | Mon. 2/m : B2/m |
| Mangani-obertiite | NaNa2(Mg3Mn3+Ti4+)Si8O22O2 | Mon. 2/m : B2/m |
| 'Unnamed (Possible K-analogue of Ferri-obertiite)' | KNa2((Mg,Fe,Na)3Fe3+(Ti,Fe))Si8O22(O,F)2 |
Common Associates
Associations Based on Photo Data:
| 4 photos of Ferri-obertiite associated with Sanidine | K(AlSi3O8) |
| 4 photos of Ferri-obertiite associated with Amphibole Supergroup | AB2C5(T8O22)W2 |
| 3 photos of Ferri-obertiite associated with Mullite | Al4+2xSi2-2xO10-x |
| 1 photo of Ferri-obertiite associated with Pyroxene Group | ADSi2O6 |
Related Minerals - Strunz-mindat Grouping
| 9.DE. | Shojiite | Na(NaMg)Mg5Si8O22(OH)2 |
| 9.DE. | Clino-suenoite | ◻Mn2+2(Mg5)(Si8O22)(OH)2 |
| 9.DE. | Mangani-eckermannite | NaNa2(Mg4Mn3+)Si8O22(OH)2 |
| 9.DE.05 | 'Permanganogrunerite' | ◻{Mn2+2}{Mn2+5}(Si8O22)(OH)2 |
| 9.DE.05 | Cummingtonite | ◻Mg2Mg5(Si8O22)(OH)2 |
| 9.DE.05 | Ferri-fluoro-leakeite | NaNa2(Mg2Fe3+2Li)(Si8O22)F2 |
| 9.DE.05 | Grunerite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DE.05 | Clino-holmquistite Root Name Group | ◻Li2(C2+3C3+2)(Si8O22)w2 |
| 9.DE.10 | Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| 9.DE.10 | Fluoro-cannilloite | CaCa2(Mg4Al)(Si5Al3)O22F2 |
| 9.DE.10 | Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 |
| 9.DE.10 | Clino-ferro-suenoite | ◻Mn2+2(Fe2+5)(Si8O22)(OH)2 |
| 9.DE.10 | Fluoro-tremolite | ◻Ca2Mg5(Si8O22)F2 |
| 9.DE.10 | 'Parvo-manganotremolite' | ◻{CaMn2+}{Mg5}(Si8O22)(OH)2 |
| 9.DE.10 | Magnesio-ferri-hornblende | ◻Ca2(Mg4Fe3+)[(Si7Al)O22](OH)2 |
| 9.DE.10 | Ferro-ferri-hornblende | ◻Ca2(Fe2+4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.10 | 'Ferro-cannilloite' | CaCa2(Fe2+4Al)(Si5Al3O22)OH2 |
| 9.DE.10 | 'Ferro-ferri-cannilloite' | CaCa2(Fe2+4Fe3+)(Si5Al3O22)OH2 |
| 9.DE.10 | 'Ferro-fluoro-actinolite' | ◻{Ca2}{Fe5}(Si8O22)F2 |
| 9.DE.10 | 'Ferro-fluoro-hornblende' | ◻Ca2(Fe2+4Al)(AlSi7O22)F2 |
| 9.DE.10 | Magnesio-ferri-fluoro-hornblende | ◻Ca2(Mg4Fe3+)(AlSi7O22)F2 |
| 9.DE.10 | 'Ferro-ferri-fluoro-hornblende' | ◻Ca2(Fe2+4Fe3+)(AlSi7O22)F2 |
| 9.DE.10 | 'Ferri-fluoro-tschermakite' | ◻{Ca2}{Mg3Fe3+2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Ferro-ferri-fluoro-tschermakite' | ◻{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Ferro-fluoro-tschermakite' | ◻{Ca2}{Fe2+3Al2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Fluoro-tschermakite' | ◻{Ca2}{Mg3Al2}(Al2Si6O22)F2 |
| 9.DE.10 | 'Magnesio-fluoro-hornblende' | ◻Ca2(Mg4Al)(AlSi7O22)F2 |
| 9.DE.10 | Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
| 9.DE.10 | 'Ferro-ferri-tschermakite' | ◻{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)(OH)2 |
| 9.DE.10 | 'Cannilloite' | CaCa2(Mg4Al)(Si5Al3O22)OH2 |
| 9.DE.10 | Tschermakite | ◻Ca2(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.10 | Magnesio-hornblende | ◻Ca2(Mg4Al)(Si7Al)O22(OH)2 |
| 9.DE.10 | 'Ferri-tschermakite' | ◻Ca2(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.10 | Ferro-actinolite | ◻Ca2Fe2+5(Si8O22)(OH)2 |
| 9.DE.10 | Ferro-hornblende | ◻Ca2(Fe2+4Al)(Si7Al)O22(OH)2 |
| 9.DE.10 | Ferro-tschermakite | ◻Ca2(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.15 | Potassic-chloro-pargasite | KCa2(Mg4Al)(Si6Al2)O22Cl2 |
| 9.DE.15 | 'Ferro-fluoro-pargasite' | (Na)(Ca2)(Fe2+4Al)(Al2Si6O22)F2 |
| 9.DE.15 | 'Potassic-ferro-chloro-edenite' | KCa2Fe2+5(AlSi7O22)Cl2 |
| 9.DE.15 | 'Ferro-ferri-sadanagaite' | NaCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Hastingsite | NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Fluoro-edenite | NaCa2Mg5(Si7Al)O22F2 |
| 9.DE.15 | Pargasite | NaCa2(Mg4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Magnesio-fluoro-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-fluoro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-chloro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2 |
| 9.DE.15 | 'Unnamed (F-dominant analogue of Ferri-kaersutite)' | (Na,K)Ca2[Mg3(Fe3+,Fe2+)Ti](Si6Al2O22)(F,O)2 |
| 9.DE.15 | Edenite | NaCa2Mg5(Si7Al)O22(OH)2 |
| 9.DE.15 | Potassic-sadanagaite | KCa2(Mg3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Ferri-kaersutite | NaCa2(Mg3Fe3+Ti)(Si6Al2O22)O2 |
| 9.DE.15 | Potassic-pargasite | KCa2(Mg4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Potassic-ferro-sadanagaite | KCa2(Fe2+3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Kaersutite | NaCa2(Mg3AlTi4+)(Si6Al2)O22O2 |
| 9.DE.15 | 'Ferro-chloro-pargasite' | NaCa2(Fe2+4Al)(Al2Si6O22)Cl2 |
| 9.DE.15 | Potassic-fluoro-pargasite | KCa2(Mg4Al)(Si6Al2)O22F2 |
| 9.DE.15 | Potassic-ferro-ferri-sadanagaite | KCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | Fluoro-pargasite | NaCa2(Mg4Al)(Si6Al2)O22F2 |
| 9.DE.15 | 'Parvo-mangano-edenite' | {Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2 |
| 9.DE.15 | Ferro-fluoro-edenite | NaCa2Fe2+5(AlSi7O22)F2 |
| 9.DE.15 | Mangani-pargasite | NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Sadanagaite | NaCa2(Mg3Al2)(Si5Al3O22)(OH)2 |
| 9.DE.15 | Magnesio-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | 'Ferri-sadanagaite' | NaCa2(Mg3Fe3+2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | 'Ferro-sadanagaite' | NaCa2(Fe3Al2)(Al3Si5O22)(OH)2 |
| 9.DE.15 | 'Ferri-fluoro-sadanagaite' | {Na}{Ca2}{Mg3Fe3+2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Ferro-ferri-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Ferro-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Al2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Fluoro-sadanagaite' | {Na}{Ca2}{Mg3Al2}(Al3Si5O22)F2 |
| 9.DE.15 | 'Potassic-chloro-sadanagaite' | KCa2(Mg3Al2)(Al3Si5O22)Cl2 |
| 9.DE.15 | 'Potassic-ferro-chloro-sadanagaite' | KCa2(Fe2+3Al2)(Al3Si5O22)Cl2 |
| 9.DE.15 | Ferro-edenite | NaCa2Fe2+5(Si7Al)O22(OH)2 |
| 9.DE.15 | Oxo-magnesio-hastingsite | NaCa2(Mg3(Fe3+2-x,Tix))5(Si6Al2O22)O2 |
| 9.DE.15 | Potassic-ferro-pargasite | KCa2(Fe2+4Al)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Potassic-hastingsite | KCa2(Fe2+4Fe3+)(Al2Si6O22)(OH)2 |
| 9.DE.15 | 'Fluoro-hastingsite' | NaCa2(Fe2+4Fe3+)(Al2Si6O22)F2 |
| 9.DE.15 | Potassic-magnesio-hastingsite | KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Vanadio-pargasite | NaCa2(Mg3+4V)(Al2Si6)O22(OH)2 |
| 9.DE.15 | 'Ferro-kaersutite' | NaCa2(Fe2+3AlTi)(Si6Al2O22)O2 |
| 9.DE.15 | Chromio-pargasite | NaCa2(Mg4Cr)(Si6Al2)O22(OH)2 |
| 9.DE.15 | Ferro-pargasite | NaCa2(Fe2+4Al)(Si6Al2)O22(OH)2 |
| 9.DE.20 | 'Ghoseite' | ◻[Mn2+Na][Mg4Al]Si8O22(OH)2 |
| 9.DE.20 | Potassic-ferro-taramite | K(CaNa)(Fe2+3Al2)(Si6Al2)O22(OH)2 |
| 9.DE.20 | Ferri-fluoro-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)F2 |
| 9.DE.20 | Barroisite | ◻(CaNa)(Mg3Al2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Fluoro-richterite | Na(CaNa)Mg5(Si8O22)F2 |
| 9.DE.20 | Potassic-ferro-ferri-taramite | K(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferri-katophorite' | K(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferro-richterite' | K(CaNa)Fe2+5(Si8O22)(OH)2 |
| 9.DE.20 | Potassic-fluoro-richterite | K(CaNa)Mg5(Si8O22)F2 |
| 9.DE.20 | Potassic-richterite | K(CaNa)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferri-ghoseite | ◻(Mn2+Na)(Mg4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | Fluoro-taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-katophorite' | Na(CaNa)(Fe2+4Fe3+)(AlSi7O22)F2 |
| 9.DE.20 | Richterite | Na(CaNa)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferri-winchite | ◻(NaCa)(Mg4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | 'Fluoro-katophorite' | Na(CaNa)(Mg4Al)(AlSi7O22)F2 |
| 9.DE.20 | Hjalmarite | Na(NaMn)Mg5(Si8O22)(OH)2 |
| 9.DE.20 | Ferro-taramite | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Clinoferroholmquistite' | ◻Li2[Fe2+3Al2]Si8O22(OH,F)2 |
| 9.DE.20 | Ferro-katophorite | Na(CaNa)(Fe2+4Al)(AlSi7O22)(OH)2 |
| 9.DE.20 | Taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-fluoro-katophorite' | K(CaNa)(Mg4Al)(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-katophorite' | Na(CaNa)(Fe2+4Al)(AlSi7O22)F2 |
| 9.DE.20 | Ferri-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-barroisite' | ◻(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Ferri-taramite | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Potassic-ferro-ferri-katophorite' | K(CaNa)(Fe2+4Fe3+)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-winchite' | ◻(CaNa)(Fe2+4Fe3+)Si8O22(OH)2 |
| 9.DE.20 | Winchite | ◻(CaNa)(Mg4Al)(Si8O22)(OH)2 |
| 9.DE.20 | 'Ferro-fluoro-richterite' | {Na}{CaNa}{Fe2+5}(Si8O22)F2 |
| 9.DE.20 | 'Fluoro-winchite' | ◻(CaNa)(Mg4Al)(Si8O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-winchite' | ◻{CaNa}{Fe2+4Al}(Si8O22)F2 |
| 9.DE.20 | 'Ferri-barroisite' | ◻(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-ferri-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Ferri-fluoro-barroisite' | ◻{CaNa}{Mg3Fe3+2}(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-barroisite' | ◻{CaNa}{Fe2+3Al2}(AlSi7O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-barroisite' | ◻{CaNa}{Fe2+3Fe3+2}(AlSi7O22)F2 |
| 9.DE.20 | 'Fluoro-barroisite' | ◻{CaNa}{Mg3Al2}(AlSi7O22)F2 |
| 9.DE.20 | Ferro-ferri-katophorite | Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2 |
| 9.DE.20 | 'Ferri-fluoro-taramite' | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-ferri-fluoro-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Ferro-fluoro-taramite' | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)F2 |
| 9.DE.20 | 'Potassic-ferri-taramite' | K(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Magnesiotaramite' | {Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2 |
| 9.DE.20 | 'Ferro-barroisite' | ◻(CaNa)(Fe2+3Al2)(AlSi7O22)(OH)2 |
| 9.DE.20 | Scandio-winchite | ◻(NaCa)(Mg4Sc)(Si8O22)(OH)2 |
| 9.DE.20 | Ferro-richterite | Na(CaNa)Fe2+5(Si8O22)(OH)2 |
| 9.DE.20 | Katophorite | Na(CaNa){Mg4Al)(AlSi7O22)(OH)2 |
| 9.DE.20 | 'Ferro-winchite' | ◻(CaNa)(Fe2+4Al)(Si8O22)(OH)2 |
| 9.DE.25 | 'Clino-sodic-fluoro-holmquistite' | {Na}{Li2}{Mg4Al}(Si8O22)F2 |
| 9.DE.25 | Ferro-ferri-nybøite | NaNa2(Fe2+3,Mg)Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.25 | Clino-ferro-ferri-holmquistite | ◻Li2(Fe2+3Fe3+2)(Si8O22)(OH)2 |
| 9.DE.25 | 'Oxo-pargasite' | NaCa2(Mg3(Al2-xTix))5(Si6Al2O22)O2 |
| 9.DE.25 | 'Ferri-nybøite' | NaNa2(Mg3Fe3+2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Ferro-ferri-leakeite' | NaNa2(Fe2+2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Ferro-ferri-fluoro-leakeite | NaNa2(Fe2+2Fe3+2Li)(Si8O22)F2 |
| 9.DE.25 | Ferri-leakeite | NaNa2(Mg2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Fluoro-pedrizite | NaLi2(Mg2Al2Li)(Si8O22)F2 |
| 9.DE.25 | Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 |
| 9.DE.25 | Arfvedsonite | NaNa2(Fe2+4Fe3+)Si8O22(OH)2 |
| 9.DE.25 | 'Mangano-ferri-fluoro-leakeite' | NaNa2(Mn2+2Fe3+2Li)(Si8O22)F2 |
| 9.DE.25 | Riebeckite | ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2 |
| 9.DE.25 | 'Unnamed (Possible K-analogue of Ferri-obertiite)' | KNa2((Mg,Fe,Na)3Fe3+(Ti,Fe))Si8O22(O,F)2 |
| 9.DE.25 | Magnesio-fluoro-arfvedsonite | NaNa2(Mg4Fe3+)[Si8O22]F2 |
| 9.DE.25 | 'Ferro-fluoro-glaucophane' | ◻[Na2][Fe2+3Al2]Si8O22F2 |
| 9.DE.25 | Oxo-mangani-leakeite | NaNa2(Mn3+4Li)Si8O22O2 |
| 9.DE.25 | Fluoro-leakeite | NaNa2(Mg2Al2Li)(Si8O22)F2 |
| 9.DE.25 | Nybøite | NaNa2(Mg3Al2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Sodic-ferri-clinoferroholmquistite' | Na0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 |
| 9.DE.25 | Potassic-arfvedsonite | KNa2(Fe2+4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | 'Potassic-mangano-mangani-ungarettiite' | KNa2(Mn2+2Mn3+3)Si8O22O2 |
| 9.DE.25 | Potassic-jeanlouisite | K(NaCa)(Mg4Ti)Si8O22O2 |
| 9.DE.25 | Ferri-pedrizite | NaLi2(Mg2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | Glaucophane | ◻Na2(Mg3Al2)Si8O22(OH)2 |
| 9.DE.25 | Ferro-fluoro-pedrizite | NaLi2(Fe2+2Al2Li)[Si8O22]F2 |
| 9.DE.25 | Potassic-ferri-leakeite | KNa2(Mg2Fe3+2Li)(Si8O22)(OH)2 |
| 9.DE.25 | Potassic-magnesio-fluoro-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)F2 |
| 9.DE.25 | Mangani-obertiite | NaNa2(Mg3Mn3+Ti4+)Si8O22O2 |
| 9.DE.25 | Scandio-fluoro-eckermannite | NaNa2(Mg4Sc)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-eckermannite' | NaNa2(Fe2+4Al)Si8O22(OH)2 |
| 9.DE.25 | Ferro-ferri-pedrizite | NaLi2(Fe2+2Fe3+2Li)Si8O22(OH)2 |
| 9.DE.25 | 'Pedrizite' | NaLi2(LiMg2Al2)(Si8O22)(OH)2 |
| 9.DE.25 | Ferro-pedrizite | NaLi2(Fe2+2Al2Li)Si8O22(OH)2 |
| 9.DE.25 | Potassic-mangani-leakeite | KNa2(Mg2Mn3+2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Clino-fluoro-holmquistite' | ◻{Li2}{Mg3Al2}(Si8O22)F2 |
| 9.DE.25 | Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 |
| 9.DE.25 | Magnesio-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)(OH)2 |
| 9.DE.25 | Potassic-magnesio-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | Fluoro-nybøite | NaNa2(Mg3Al2)(AlSi7O22)(F,OH)2 |
| 9.DE.25 | Mangano-ferri-eckermannite | NaNa2(Mn2+4Fe3+)Si8O22(OH)2 |
| 9.DE.25 | 'Fluoro-glaucophane' | ◻[Na2][Mg3Al2]Si8O22F2 |
| 9.DE.25 | Fluoro-riebeckite | ◻Na2(Fe2+3Fe3+2)(Si8O22)F2 |
| 9.DE.25 | Magnesio-fluoro-riebeckite | ◻Na2(Mg3Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Fluoro-eckermannite' | NaNa2(Mg4Al}Si8O22F2 |
| 9.DE.25 | 'Ferro-fluoro-eckermannite' | NaNa2(Fe2+4Al}Si8O22F2 |
| 9.DE.25 | 'Fluoro-arfvedsonite' | NaNa2(Fe2+4Fe3+)Si8O22F2 |
| 9.DE.25 | Magnesio-arfvedsonite | NaNa2(Mg4Fe3+)(Si8O22)(OH)2 |
| 9.DE.25 | 'Ferri-fluoro-nybøite' | NaNa2(Mg3Fe3+2)(AlSi7O22)F2 |
| 9.DE.25 | 'Ferro-ferri-fluoro-nybøite' | NaNa2(Fe2+3Fe3+2)(AlSi7O22)F2 |
| 9.DE.25 | Ferro-glaucophane | ◻Na2(Fe2+3Al2)Si8O22(OH)2 |
| 9.DE.25 | 'Ferro-fluoro-nybøite' | NaNa2(Fe2+3Al2)(AlSi7O22)F2 |
| 9.DE.25 | Mangani-dellaventuraite | NaNa2(MgMn3+2Ti4+Li)Si8O22O2 |
| 9.DE.25 | 'Ferro-leakeite' | NaNa2(Fe2+2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Leakeite' | NaNa2(Mg2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Potassic-leakeite' | KNa2(Mg2Al2Li)(Si8O22)(OH)2 |
| 9.DE.25 | 'Ferri-fluoro-pedrizite' | NaLi2(LiMg2Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-ferri-fluoro-pedrizite' | NaLi2(LiFe2+2Fe3+2)(Si8O22)F2 |
| 9.DE.25 | 'Ferro-nybøite' | NaNa2(Fe2+3Al2)(AlSi7O22)(OH)2 |
| 9.DE.25 | 'Clino-ferro-ferri-fluoro-holmquistite' | ◻{Li2}{Fe2+3Fe3+2}(Si8O22)F2 |
| 9.DE.25 | Mangano-mangani-ungarettiite | NaNa2(Mn2+2Mn3+3)(Si8O22)O2 |
| 9.DE.25 | 'Clino-ferri-fluoro-holmquistite' | ◻{Li2}{Mg3Fe3+2}(Si8O22)F2 |
| 9.DE.25 | 'Clino-ferro-fluoro-holmquistite' | ◻{Li2}{Fe2+3Al2}(Si8O22)F2 |
Fluorescence of Ferri-obertiite
Not fluorescent.
Other Information
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 Ferri-obertiite
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https://www.mindat.org/min-46414.html
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References for Ferri-obertiite
Reference List:
Oberti, Roberta, Ungaretti, Luciano, Cannillo, Elio, Hawthorne, Frank C. (1992) The behaviour of Ti in amphiboles: I. Four- and six-coordinate Ti in richterite. European Journal of Mineralogy, 4 (3) 425-440 doi:10.1127/ejm/4/3/0425
Hawthorne, Frank C., Cooper, Mark A., Grice, Joel D., Ottolini, Luisa (2000) A new anhydrous amphibole from the Eifel region, Germany: Description and crystal structure of obertiite, NaNa2(Mg3Fe3+Ti4+)Si8O22O2. American Mineralogist, 85 (1) 236-241 doi:10.2138/am-2000-0124
Hawthorne, F. C., Oberti, R., Harlow, G. E., Maresch, W. V., Martin, R. F., Schumacher, J. C., Welch, M. D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97 (11) 2031-2048 doi:10.2138/am.2012.4276
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter no 28. Mineralogical Magazine, 79 (7) 1859-1864 doi:10.1180/minmag.2015.079.7.18
Oberti, Roberta, Boiocchi, Massimo, Hawthorne, Frank C., Ball, Neil A., Blass, Günter (2017) Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex, Germany: mineral data and crystal chemistry of a new amphibole end-member. Mineralogical Magazine, 81 (3) 641-651 doi:10.1180/minmag.2016.080.117
Localities for Ferri-obertiite
Showing 9 localities.
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Germany | |
| |
| Blaß et al. (2005) +1 other reference |
| Hålenius et al. (2015) +2 other references |
| Blaß et al. (2001) +1 other reference |
| Künzel et al. (2011) | |
| in the collection of Christof Schäfer +1 other reference |
| Blaß et al. (2001) +1 other reference |
Russia | |
| Sharygin (2020) |
USA | |
| Robin D. Tibbit (deceased) |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany