Mgriite Mineral Data

Mgriite Mineral Data +

General Mgriite Information

Chemical Formula:

Cu3AsSe3

Composition:

Molecular Weight = 502.44 gm

Copper 37.94 % Cu

Arsenic 14.91 % As

Selenium 47.15 % Se

______

100.00 %

Empirical Formula:

Cu₃AsSe₃

Environment:

In hydrotherma veins.

IMA Status:

Approved IMA 1982

Locality:

Erzgibirge, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the Moscow Geological Exploration Institute (MGEI).

Synonym:

ICSD 42582

PDF 40-1251

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Mgriite Crystallography

Cell Dimensions:

a = 5.53, Z = 1; V = 169.11 Den(Calc)= 4.93

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.952(1), 3.18(1), 1.671(0.5),

Crystal Structure:

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Bayliss P , The Canadian Mineralogist , 28 (1990) p.751-755, Revised unit cell dimensions, space group,, and chemical formua of some metallic minerals, Locality: synthetic

Physical Properties of Mgriite

Cleavage:

None

Color:

Brownish gray, Light gray.

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5-5 - Near Apatite

Luster:

Metallic

Optical Properties of Mgriite

RL Color:

Gray with brownish tint.

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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R

Calculated Properties of Mgriite

Electron Density:

r_electron=4.36 gm/cc
note: r_Mgriite=4.93 gm/cc.

Fermion Index

Fermion Index = 0.03583
Boson Index = 0.96417

Photoelectric:

PE_Mgriite= 66.36 barns/electron
U=PE_Mgriite x r_electron= 289.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mgriite is Not Radioactive

Mgriite Classification

Dana Class:

3.4.7.2 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.7)Dana Group

3.4.7.2 Mgriite Cu3AsSe3 F d3m 4/m 3 2/m

Strunz Class:

II/C.11-75 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.11 - Tetrahedrite group

II/C.11-10 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m

II/C.11-20 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m

II/C.11-30 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m

II/C.11-40 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m

II/C.11-50 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m

II/C.11-60 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m

II/C.11-70 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m

II/C.11-75 Mgriite Cu3AsSe3 F d3m 4/m 3 2/m

II/C.11-80 Chameanite (Cu,Fe)4As(Se,S)4 I 43m 4 3m

Other Mgriite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Mgriite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Mgriite

Cu3AsSe3
Dana No: 3.4.7.2 Strunz No: II/C.11-75
Locality:

Notes: