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Mgriite

A valid IMA mineral species
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04546030017271925111508.jpg
Mgriite

Schlema-Hartenstein mining district, Saxony, Germany
04546030017271925111508.jpg
Mgriite

Schlema-Hartenstein mining district, Saxony, Germany
04546030017271925111508.jpg
Mgriite

Schlema-Hartenstein mining district, Saxony, Germany
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About MgriiteHide

08444640017271925157486.jpg
Russian State Geological Prospecting University
Formula:
Cu3AsSe3
Colour:
Gray with a brownish tint in reflected light.
Lustre:
Metallic
Hardness:
4½ - 5
Specific Gravity:
4.9 (Calculated)
Crystal System:
Isometric
Name:
Named by Yu.M. Dymkov, T.I. Loseva, E.N. Zavyalov, B.I. Ryzhov, and L.I. Bocheck in 1982 in honor of the Moskovskiy Geologorazvedochniy Institut, MGRI (in Russian: Московский Геологоразведочный Институт, МГРИ, which may be translated as Geological survey institute of Moscow), the institute where the mineral was discovered. The institute is now named the Russian State Geological Prospecting University.
See also Chaméanite.


Unique IdentifiersHide

Mindat ID:
2701
Long-form identifier:
mindat:1:1:2701:0

Similar NamesHide

IMA Classification of MgriiteHide

Classification of MgriiteHide

Strunz-mindat (2026):
2.LA.45

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
Dana 8th ed.:
3.4.7.2

3 : SULFOSALTS
4 : ø = 3
Hey's CIM Ref.:
3.1.21

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu

Mineral SymbolsHide

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

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

Physical Properties of MgriiteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Gray with a brownish tint in reflected light.
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN20=287 - 379 kg/mm2 (15 s test time) - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
4.9 g/cm3 (Calculated)

Optical Data of MgriiteHide

Reflectivity:
WavelengthR1 (%)
420nm27.1%
460nm26.7%
500nm26.4%
540nm26.9%
580nm27.0%
620nm26.8%
660nm26.4%
700nm26.0%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 27.1%.
Colour in reflected light:
Gray with a brownish tint

Chemistry of MgriiteHide

Mindat Formula:
Cu3AsSe3
Element Weights:
Element% weight
Se47.146 %
Cu37.943 %
As14.912 %

Calculated from ideal end-member formula.
Se
Cu
As
Elements listed:
As, Cu, Se - search for minerals with similar chemistry
Common Impurities:
Fe

Crystallography of MgriiteHide

Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 5.530(5) Å
Unit Cell V:
169.11 ų (Calculated from Unit Cell)
Z:
1

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005251MgriiteBayliss P (1990) Revised unit cell dimensions, space group, and chemical formula of some metallic minerals The Canadian Mineralogist 28 751-7551990synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.18 Å(100)
1.952 Å(100)
1.671 Å(50)
1.268 Å(40)
1.129 Å(40)
0.978 Å(40)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of MgriiteHide

Type Locality:
ⓘ Schlema-Hartenstein mining district, Saxony, Germany
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
Hydrothermal vein
Associated Minerals at Type Locality:
ClausthaliteUmangite
Reference:
Dymkov, Y.M., Loseva, T.I., Zavyalov, E.N., Ryzhov, B.I., Bocheck, L.I. (1982) Mgriit, Cu3AsSe3, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 111: 215-219.

Synonyms of MgriiteHide

Other Language Names for MgriiteHide

Dutch:Mgriiet
German:Mgriit
Spanish:Mgriita

Related Minerals - Strunz-mindat GroupingHide

2.LA.ThunderbayiteTlAg3Au3Sb7S6Tric. 1 : P1
2.LA.AuerbakhiteMnTl2As2S5Orth.
2.LA.BiagioniiteTl2SbS2Mon. m : Pb
2.LA.Ferrofettelite[Ag6As2S7][Ag10FeAs2S8]Mon. 2 : B2
2.LA.GladkovskyiteMnTlAs3S6Trig. 3m : R3c
2.LA.10DervilliteAg2AsS2Mon. m : Pb
2.LA.15DaomaniteCuPtAsS2Orth.
2.LA.20VaughaniteTlHgSb4S7Tric.
2.LA.25CriddleiteTlAg2Au3Sb10S10Mon.
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8] Mon. 2 : B2
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4Iso.
2.LA.40ArcubisiteAg6CuBiS4
2.LA.50Benleonardite[Ag6(Sb,As)2S6Te][Ag9Cu(S,Te)2Te2]Trig. 3m(32/m) : P3m1
2.LA.55TsnigriiteAg9SbTe3S3Mon.
2.LA.60BorovskitePd3SbTe4Iso.
2.LA.65JonassoniteAuBi5S4Mon.
2.LA.65NuwaiteNi6GeS2Tet. 4/mmm(4/m2/m2/m) : I4/mmm
2.LA.65ButianiteNi6SnS2Tet. 4/mmm(4/m2/m2/m) : I4/mmm
2.LA.70RaberiteTl5Ag4As6SbS15 Tric. 1 : P1
2.LA.75SpaltiiteTl2Cu2As2S5Mon. 2/m : P21/c

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 MgriiteHide

References for MgriiteHide

Reference List:
Bayliss, P. (1990) Revised unit cell dimensions, space group, and chemical formula of some metallic minerals. Canadian Mineralogist: 28: 751-755.
Annamamedov, R., Berger, L.I., Petrov, V.M., Slobodchikov, S.V. (1966) [Electrical, optical, and physicochemical properties of a number of semiconductors of the A3(1)B(V)C4(VI) type]. Доклады Академии Наук СССР (Doklady Akademii Nauk SSSR) [Proceedings of the USSR Academy of Sciences], 166. 1195-1198
Imamov, R.M., Petrov, I.I. (1968) Electron-diffraction study of the semiconducting compound CuAsSe2. Soviet Physics - Crystallography: 13: 335-338.
Dymkov, Y.M., Loseva, T.I., Zavyalov, E.N., Ryzhov, B.I., Bocheck, L.I. (1982) Mgriit, Cu3AsSe3, novyi mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 111: 215-219. (in Russian)
Dymkov, Y.M., Loseva, T.I., Zavyalov, E.N., Ryzhov, B.I., Bocheck, L.I. (1982) Mgriit, Cu3AsSe3, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 111: 215-219.
Fleischer, Michael, Pabst, Adolf (1983) New Mineral Names. American Mineralogist, 68 (1-2) 280-283
Majid, C., Hussain, M. (1987) Crystal data for ternary compounds of the system Cu-As2Se3. Journal of Applied Crystallography: 20: 323.
Dymkov, Y.M., Ryzhov, B.I., Begizov, V.I., Dubakina, L.S., Zav'yalov, E.N., Ryabeva, V.G., Tsvetkova, M.V. (1991) Mgriite, bismuth petrovicite and associated selenides from carbonate veins of the Erzgebirge. Novye Dannye o Mineralakh: 37: 81-101. (in Russian)
Jambor, John L., Burke, Ernst A. J. (1991) New Mineral Names. American Mineralogist, 76 (11-12) 2020-2026
Jambor, John L., Pertsev, Nikolai N., Roberts, Andrew C. (1995) New Mineral Names. American Mineralogist, 80 (7-8). 845-850
(2005) Mgriite. Handbook of Mineralogy. Mineralogical Society of America

Localities for MgriiteHide

Showing 2 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.
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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.
Germany
 
  • Saxony
    • Erzgebirgskreis
      • Aue-Bad Schlema
Forster et al. (2004)
Dymkov +7 other references
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