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Mariinskite

A valid IMA mineral species
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About MariinskiteHide

Formula:
BeCr2O4
Colour:
black to dark green
Lustre:
Vitreous
Hardness:
Specific Gravity:
4.25
Crystal System:
Orthorhombic
Name:
Named after the Mariinskoe deposit, Russia; the type locality.
Chromium-dominant analogue of Chrysoberyl.



Unique IdentifiersHide

Mindat ID:
42842
Long-form identifier:
mindat:1:1:42842:4
GUID
(UUID V4):
fb1288ff-e29c-42e1-be7c-59603b09a619

IMA Classification of MariinskiteHide

Classification of MariinskiteHide

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

Mineral SymbolsHide

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

SymbolSourceReference
MiiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MariinskiteHide

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 MariinskiteHide

Type:
Biaxial (+)
RI values:
nα = 2.050 nβ = 2.090(3) nγ = 2.150(1)
2V:
Measured: 80° (10), Calculated: 80.5°
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
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).

Chemistry of MariinskiteHide

Mindat Formula:
BeCr2O4

Crystallography of MariinskiteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020027MariinskiteYamnova 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 30-352014Mariinskoe deposit (Middle Urals, Russia)0293
0020028MariinskiteYamnova 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 30-352014Mariinskoe deposit (Middle Urals, Russia)0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 3a: Earth’s earliest Hadean crust>4.50
7 : Ultramafic igneous rocks

Type Occurrence of MariinskiteHide

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:
Reference:
Pautov, L.A., Popov, M.P., Erokhin, Y.V., Khiller, V.V., Karpenko, V.Y. (2013). Mariinskite, BeCr2O4, a new mineral, chromium analog of chrysoberyl. Geology of Ore Deposits: 55(8): 648-662.

Synonyms of MariinskiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
12 photos of Mariinskite associated with PhlogopiteKMg3(AlSi3O10)(OH)2
11 photos of Mariinskite associated with ChromiteFe2+Cr3+2O4

Related Minerals - Strunz-mindat GroupingHide

4.BA.ChihmingiteNiAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BA.05ChrysoberylBeAl2O4Orth. mmm (2/m 2/m 2/m)

Fluorescence of MariinskiteHide

Other InformationHide

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 MariinskiteHide

References for MariinskiteHide

Localities for MariinskiteHide

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.

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.
Russia
 
  • Khabarovsk Krai
Буханова (2018)
  • Sverdlovsk Oblast
    • Asbest
Erokhin et al. (2014) +1 other reference
    • Malyshevo
Williams et al. (2011) +2 other references
 
Mineral and/or Locality  
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