Log In
Omariniite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Omariniite
Ricardo H. Omarini
Formula:
Cu8Fe2ZnGe2S12
Colour:
Orange-brown
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
4.319 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of Dr. Ricardo Héctor Omarini (17 March 1946, Córdoba, Argentina - 28 June 2015), Professor at the University of Salta, for his numerous contributions to the geology of Argentina.
The Ge analogue of stannoidite. Chemically somewhat similar to zincobriartite, renierite, and briartite. X-ray single-crystal studies (R1 = 0.023) revealed the structure to be a sphalerite derivative identical to that of stannoidite (Bindi et al. 2017).
Unique Identifiers
Mindat ID:
50348
Long-form identifier:
mindat:1:1:50348:8
Similar Names
| Imerinite | A synonym of Amphibole Supergroup |
IMA Classification of Omariniite
Approved
IMA Formula:
Cu1+8Fe3+2Zn2+Ge4+2S2-12
Approval year:
2016
First published:
2017
Classification of Omariniite
2.CB.10c
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
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 |
|---|---|---|
| Oma | 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 Omariniite
Metallic
Transparency:
Opaque
Colour:
Orange-brown
Comment:
in polished sections
Streak:
Brownish-black
Hardness:
3½ on Mohs scale
Hardness:
VHN100= 202 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Not observed in the polished sections
Not observed in the polished sections
Parting:
Not observed in the polished sections
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.319 g/cm3 (Calculated)
Optical Data of Omariniite
Anisotropism:
Distinctly, with rotation tints varying between brownish-orange and greenish-brown.
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 22.0% | 21.9% |
| 420nm | 20.9% | 21.5% |
| 440nm | 20.2% | 21.0% |
| 460nm | 19.7% | 21.0% |
| 480nm | 19.5% | 21.0% |
| 500nm | 19.4% | 21.1% |
| 520nm | 19.75% | 21.4% |
| 540nm | 20.4% | 21.8% |
| 560nm | 21.2% | 22.2% |
| 580nm | 22.1% | 22.8% |
| 600nm | 23.2% | 23.5% |
| 620nm | 24.2% | 24.2% |
| 640nm | 25.3% | 25.0% |
| 660nm | 26.2% | 25.7% |
| 680nm | 27.2% | 26.6% |
| 700nm | 28.2% | 27.4% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 28.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
orange-brown
Internal Reflections:
Absent
Pleochroism:
Weak
Chemistry of Omariniite
Mindat Formula:
Cu8Fe2ZnGe2S12
Element Weights:
Crystallography of Omariniite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
I222
Cell Parameters:
a = 10.774(1) Å, b = 5.3921(5) Å, c = 16.085(2) Å
Ratio:
a:b:c = 1.998 : 1 : 2.983
Unit Cell V:
934.5 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.106 Å | (100) |
| 2.696 Å | (6) |
| 1.905 Å | (24) |
| 1.901 Å | (23) |
| 1.900 Å | (23) |
| 1.625 Å | (12) |
| 1.624 Å | (12) |
| 1.618 Å | (11) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Omariniite
General Appearance of Type Material:
Seams in ore rarely exceeds 60 μm.
Place of Conservation of Type Material:
Collections of the Systematic Reference Series of the National Mineral Collection of Canada, Geological Survey of Canada, Ottawa, Ontario, Canada (catalogue number NMCC 68096)
Empirical Formula of Type Material:
Cu8.04(Fe2.03In0.02)Σ2.05Zn0.96Ge1.94S12.01
Chemical Analysis of Type Material:
| Cu | 42.18) % |
|---|---|
| Fe | 9.37 % |
| Zn | 5.17 % |
| In | 0.20 % |
| Ge | 11.62 % |
| S | 31.80 % |
| Total: | 100.34 % |
Geological Setting of Type Material:
In bornite-chalcocite-rich ores of the Capillitas epithermal deposit
Associated Minerals at Type Locality:
Synonyms of Omariniite
Other Language Names for Omariniite
Dutch:Omariniiet
German:Omariniit
Relationship of Omariniite to other Species
Member of:
Other Members of Stannite Group:
| Briartite | Cu2FeGeS4 | Tet. |
| Černýite | Cu2CdSnS4 | Tet. 42m : I42m |
| Famatinite | Cu3SbS4 | Tet. 42m : I42m |
| Ferrokësterite | Cu2FeSnS4 | Tet. 4 : I4 |
| Hocartite | Ag2(Fe2+,Zn)SnS4 | Tet. 42m : I42m |
| Kësterite | Cu2ZnSnS4 | Tet. 4 : I4 |
| Keutschite | Cu2AgAsS4 | Tet. 42m : I42m |
| Kuramite | Cu3SnS4 | Tet. 42m : I42m |
| Luzonite | Cu3AsS4 | Tet. 42m : I42m |
| Permingeatite | Cu3SbSe4 | Tet. 42m : I42m |
| Petrukite | (Cu,Fe,Zn,Ag)3(Sn,In)S4 | Orth. mm2 : Pmn21 |
| Pirquitasite | Ag2ZnSnS4 | Tet. 4 : I4 |
| Richardsite | Zn2CuGaS4 | Tet. 42m : I42m |
| Stannite | Cu2FeSnS4 | Tet. 42m : I42m |
| Stannoidite | Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 | Orth. 222 : I222 |
| 'UM1984-30-S:CuFeSn' | Cu2Fe2Sn3S7 | |
| 'Unnamed (Cu-Zn-In Sulphide)' | CuZn2InS4 | |
| Velikite | Cu2HgSnS4 | Tet. 4 : I4 |
| Zincobriartite | Cu2(Zn,Fe)(Ge,Ga)S4 | Tet. 42m : I42m |
Common Associates
Associations Based on Photo Data:
| 1 photo of Omariniite associated with Thalcusite | Tl2Cu3FeS4 |
| 1 photo of Omariniite associated with Putzite | (Cu4.7Ag3.3)GeS6 |
Capillitas mining district, Andalgalá, Andalgalá Department, Catamarca Province, Argentina