Mineralogy Database

Mgriite Mineral Data

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General Mgriite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Fe)3AsSe3
Help on Composition: Composition: Molecular Weight = 496.67 gm
   Iron       8.43 %  Fe
   Copper    28.79 %  Cu
   Arsenic   15.08 %  As
   Selenium  47.69 %  Se
            100.00 % 
Help on Empirical Formula: Empirical Formula: Cu2.25Fe2+0.75AsSe3
Help on Environment: Environment: In hydrotherma veins.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Erzgibirge, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Moscow Geological Exploration Institute (MGEI).
Help on Name Pronunciation: Name Pronunciation: Mgriite Say MGRIITE
Help on Synonym: Synonym: ICSD 42582
  PDF 40-1251

Mgriite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.53, Z = 1; V = 169.11 Den(Calc)= 4.88
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.952(1), 3.18(1), 1.671(0.5),

Physical Properties of Mgriite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish gray, Light gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Metallic

Optical Properties of Mgriite

Help on RL Color: RL Color: Gray with brownish tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mgriite in Air
λ R  ∑ R(λ) 
 420 nm   27.10   
 460 nm   26.70 
 500 nm   26.40 
 540 nm   26.90 
 580 nm   27.00 
 620 nm   26.80 
 660 nm   26.40 
 700 nm   26.00 
Calculated Relative Intensity Colors of Mgriite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 330%

Calculated Properties of Mgriite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.32 gm/cc
note: Specific Gravity of Mgriite =4.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEMgriite = 65.24 barns/electron
U=PEMgriite x rElectron Density= 281.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mgriite is Not Radioactive

Mgriite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.07)Dana Group Mgriite (Cu,Fe)3AsSe3 F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 02.LA.45 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LA -Without essential Pb
02.LA.45 Mgriite (Cu,Fe)3AsSe3 F d3m 4/m 3 2/m

Other Mgriite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Mgriite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.LA.45





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