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Mgriite Mineral Data
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General Mgriite Information
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 Chemical Formula: |
(Cu,Fe)3AsSe3 |
| Composition: |
Molecular Weight = 496.67 gm |
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Iron 8.43 % Fe |
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Copper 28.79 % Cu |
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Arsenic 15.08 % As |
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Selenium 47.69 % Se |
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______ |
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100.00 % |
| Empirical Formula: |
Cu2.25Fe2+0.75AsSe3 |
| 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). |
| Name Pronunciation: |
Mgriite  |
| Synonym: |
ICSD 42582 |
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PDF 40-1251 |
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Mgriite Crystallography
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| Cell Dimensions: |
a = 5.53, Z = 1; V = 169.11 Den(Calc)= 4.88 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m |
| X Ray Diffraction: |
By Intensity(I/Io): 1.952(1), 3.18(1), 1.671(0.5), |
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Physical Properties of Mgriite
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| Cleavage: |
None |
| Color: |
Brownish gray, Light gray. |
| Diaphaneity: |
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 |
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Optical Properties of Mgriite
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| RL Color: |
Gray with brownish tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Mgriite in Air
| λ |
R |
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∑ R(λ) |
| 420 nm |
27.10 |
 |
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| 460 nm |
26.70 |
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| 500 nm |
26.40 |
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| 540 nm |
26.90 |
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| 580 nm |
27.00 |
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| 620 nm |
26.80 |
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| 660 nm |
26.40 |
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| 700 nm |
26.00 |
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Calculated Relative Intensity Colors of Mgriite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
330% |
| R |
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Calculated Properties of Mgriite
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| Electron Density: |
Bulk Density (Electron Density)=4.32 gm/cc
note: Specific Gravity of Mgriite =4.88 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEMgriite = 65.24 barns/electron
U=PEMgriite x rElectron Density= 281.73 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mgriite is Not Radioactive |
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Mgriite Classification
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| Dana Class: |
03.04.07.02 (03)Sulfides - Sulfosalts |
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(03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.04.07)Dana Group |
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03.04.07.02 Mgriite (Cu,Fe)3AsSe3 F d3m 4/m 3 2/m |
| Strunz Class: |
02.LA.45 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LA -Without essential Pb |
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02.LA.45 Mgriite (Cu,Fe)3AsSe3 F d3m 4/m 3 2/m |
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Other Mgriite Information
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| 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 - 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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Print or Cut-and-Paste your Mgriite Specimen Label here :
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Mgriite
(Cu,Fe)3AsSe3
Dana No: 03.04.07.02 Strunz No: 02.LA.45
Locality:
Notes:
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