Mariinskite
A valid IMA mineral species
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About Mariinskite
Formula:
BeCr2O4
Colour:
black to dark green
Lustre:
Vitreous
Hardness:
8½
Specific Gravity:
4.25
Crystal System:
Orthorhombic
Name:
Named after the Mariinskoe deposit, Russia; the type locality.
Type Locality:
Unique Identifiers
Mindat ID:
42842
Long-form identifier:
mindat:1:1:42842:4
Similar Names
| Murunskite | A valid IMA mineral species | K2(Cu,Fe)4S4 |
IMA Classification of Mariinskite
Approved
IMA Formula:
Cr3+2BeO4
Approval year:
2011
First published:
2013
Classification of Mariinskite
4.BA.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
A : With small and medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
A : With small and medium-sized cations
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 |
|---|---|---|
| Mii | 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 Mariinskite
Vitreous
Transparency:
Transparent
Colour:
Black to dark green
Streak:
Light green
Hardness:
8½ on Mohs scale
Hardness:
VHN150=1725 kg/mm2 - Vickers
Density:
4.25(2) g/cm3 (Measured) 4.25 g/cm3 (Calculated)
Optical Data of Mariinskite
Type:
Biaxial (+)
RI values:
nα = 2.05 nβ = 2.09(3) nγ = 2.15(1)
2V:
Measured: 80° (10), Calculated: 80.5°
Max. Birefringence:
δ = 0.100
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.
Anisotropism:
weak
Bireflectance:
weak
Colour in reflected light:
gray with a very weak bluish tint
Internal Reflections:
strong - green
Pleochroism:
Strong
Comments:
emerald green on X, yellow green on Y to greenish yellow on Z.
emerald-green (Ng) to yellowish-green (Np).
emerald-green (Ng) to yellowish-green (Np).
Chemistry of Mariinskite
Mindat Formula:
BeCr2O4
Element Weights:
Elements listed:
Crystallography of Mariinskite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
P212121
Cell Parameters:
a = 9.709(2) Å, b = 5.612(1) Å, c = 4.492(1) Å
Ratio:
a:b:c = 1.73 : 1 : 0.8
Unit Cell V:
244.76 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Pseudohexagonal chrysoberyl-type twins
Comment:
Originally assumed to be Pnma.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0020028 | Mariinskite | Yamnova N A, Aksenov S M, Pautov L A, Popov M P, Erokhin Y V (2014) Specific features of cation distribution in the crystal structure of mariinskite BeCr2O4 (derivative of olivine-type structure) Crystallography Reports 59 30-35 | 2014 | Mariinskoe deposit (Middle Urals, Russia) | 0 | 293 | |
| 0020027 | Mariinskite | Yamnova N A, Aksenov S M, Pautov L A, Popov M P, Erokhin Y V (2014) Specific features of cation distribution in the crystal structure of mariinskite BeCr2O4 (derivative of olivine-type structure) Crystallography Reports 59 30-35 | 2014 | Mariinskoe deposit (Middle Urals, Russia) | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.85 Å | (3) |
| 4.08 Å | (4) |
| 3.31 Å | (9) |
| 2.629 Å | (5) |
| 2.434 Å | (5) |
| 2.381 Å | (4) |
| 2.139 Å | (6) |
| 1.651 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 7 : Ultramafic igneous rocks |
Type Occurrence of Mariinskite
General Appearance of Type Material:
anhedral fine grains
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Science, Leninsky Prospect,Moscow, Russia, registration number 4159/1
Geological Setting of Type Material:
Chromite pod in serpentinite
Associated Minerals at Type Locality:
Synonyms of Mariinskite
Other Language Names for Mariinskite
Dutch:Mariinskiet
German:Mariinskit
Common Associates
Associations Based on Photo Data:
| 12 photos of Mariinskite associated with Phlogopite | KMg3(AlSi3O10)(OH)2 |
| 11 photos of Mariinskite associated with Chromite | Fe2+Cr3+2O4 |
Related Minerals - Strunz-mindat Grouping
| 4.BA. | Chihmingite | NiAl2O4 |
| 4.BA.05 | Chrysoberyl | BeAl2O4 |
Fluorescence of Mariinskite
none
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 Mariinskite
mindat.org URL:
https://www.mindat.org/min-42842.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Mariinskite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 11. Mineralogical Magazine, 75 (6) 2887-2893 doi:10.1180/minmag.2011.075.6.2887
Pautov, L. A., Popov, M. P., Erokhin, Yu. V., Khiller, V. V., Karpenko, V. Yu. (2013) Mariinskite, BeCr2O4, a new mineral, chromium analog of chrysoberyl. Geology of Ore Deposits, 55 (8) 648-662 doi:10.1134/s1075701513080096
Yamnova, N. A., Aksenov, S. M., Pautov, L. A., Popov, M. P., Erokhin, Yu. V. (2014) Specific features of cation distribution in the crystal structure of mariinskite BeCr2O4 (Derivative of olivine-type structure) Crystallography Reports, 59 (1) 30-35 doi:10.1134/s1063774514010192
Localities for Mariinskite
Showing 3 localities.
symbol to view information about a locality.
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.
Russia | |
| Буханова (2018) |
| Erokhin et al. (2014) +1 other reference |
| Pautov et al. (2013) +1 other reference |
Quick NavTopAbout MariinskiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Malyshevskoe deposit, Malyshevo, Sverdlovsk Oblast, Russia