Mgriite Mineral Data

Mgriite Mineral Data +

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

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

Search for Mgriite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Mgriite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Mgriite :
AA Mineral Specimens
B and L Minerals
Crystal Vaults
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Mgriite Mineral Data :

Ask about Mgriite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Mgriite Specimen Label here :

Mgriite

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

Notes: