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Montbrayite Mineral Data
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General Montbrayite Information
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 Chemical Formula: |
(Au,Sb)2Te3 |
| Composition: |
Molecular Weight = 739.12 gm |
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Antimony 8.24 % Sb |
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Tellurium 51.79 % Te |
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Gold 39.97 % Au |
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______ |
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100.00 % |
| Empirical Formula: |
Au1.5Sb0.5Te3 |
| Environment: |
Found with other tellurides, sulfides, and gold in coarsely crystalline masses. Also found rimming gold grains. |
| IMA Status: |
Valid Species (Pre-IMA) 1946 |
| Locality: |
Robb-Montbray mine, Montbray, Abitibi County, Quebec, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Name for the locality. |
| Name Pronunciation: |
Montbrayite + Pronunciation  |
| Synonym: |
ICSD 23594 |
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PDF 25-364 |
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Montbrayite Crystallography
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| Axial Ratios: |
a:b:c =0.8989:1:0.8023 |
| Cell Dimensions: |
a = 12.1, b = 13.46, c = 10.8, Z = 12; alpha = 104.501°, beta = 97.567°, gamma = 107.888° V = 1,606.48 Den(Calc)= 9.17 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.09(1), 2.93(0.8), 2.98(0.8), |
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Physical Properties of Montbrayite
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| Cleavage: |
{110} Distinct, {011} Distinct, {111} Distinct |
| Color: |
Yellowish white, Light yellow, Tin white. |
| Density: |
9.94 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
| Streak: |
white |
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Optical Properties of Montbrayite
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| RL Anisotrophism: |
Weak to moderate, light gray, yellow-brown, and blue-gray. |
| RL Pleochroism: |
Very weak. |
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Calculated Properties of Montbrayite
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| Electron Density: |
Bulk Density (Electron Density)=7.57 gm/cc
note: Specific Gravity of Montbrayite =9.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEMontbrayite = 895.39 barns/electron
U=PEMontbrayite x rElectron Density=6,781.51 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montbrayite is Not Radioactive |
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Montbrayite Classification
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| Dana Class: |
02.11.08.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.11)where Am Bn Xp, with (m+n):p=2:3 |
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(02.11.08)Dana Group |
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02.11.08.01 Montbrayite (Au,Sb)2Te3 P1 1 |
| Strunz Class: |
02.DB.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.D - Metal Sulfides, M:S = 3:4 and 2:3 |
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02.DB -M:S = 2:3 and similar |
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02.DB.20 Montbrayite (Au,Sb)2Te3 P1 1 |
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Other Montbrayite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Montbrayite :
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 Montbrayite Specimen Label here :
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Montbrayite
(Au,Sb)2Te3
Dana No: 02.11.08.01 Strunz No: 02.DB.20
Locality:
Notes:
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