Montbrayite Mineral Data + 
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- 2.11.8.1 Montbrayite (Au,Sb)2Te3 P1 1
- II/D.15-10 Montbrayite (Au,Sb)2Te3 P1 1
- II/D.15-20 Nagyagite AuPb(Sb,Bi)Te2-3S6 P 4 4
- II/D.15-30 Buckhornite AuPb2BiTe2S3 P mmm 2/m 2/m 2/m
General Montbrayite Information |
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 Chemical Formula: |
(Au,Sb)2Te3 | ||
| Composition: |
Molecular Weight = 739.12 gm | ||
| Antimony 8.24 % Sb | |||
| Tellurium 51.79 % Te | |||
| Gold 39.97 % Au | |||
| ______ | |||
| 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, Québec, Canada. Link to MinDat.org Location Data. | ||
| Name Origin: |
Name for the locality. | ||
| Synonym: |
ICSD 23594 | ||
| PDF 25-364 | |||
Search for Montbrayite Images | |||
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Images:
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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 - PinacoidalH-M Symbol ( 1) Space Group: P1 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.09(1), 2.93(0.8), 2.98(0.8), | ||
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 | ||
| Diaphaniety: |
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 | ||
Optical Properties of Montbrayite |
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| RL Anisotrophism: |
Weak to moderate, light gray, yellow-brown, and blue-gray. | ||
| RL Pleochroism: |
Very weak. | ||
Calculated Properties of Montbrayite |
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| Electron Density: |
relectron=7.44 gm/cc |
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| Fermion Index |
Fermion Index = 0.04138 Boson Index = 0.95862 |
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| Photoelectric: |
PEMontbrayite = 895.39 barns/electron |
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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: |
2.11.8.1 (2)Sulfides - Including Selenides and Tellurides | ||
| (2.11)where Am Bn Xp, with (m+n):p=2:3 | |||
| (2.11.8)Dana Group | |||
| Strunz Class: |
II/D.15-10 II - Sulfides and sulphosalts | ||
| II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold | |||
| II/D.15 - Montbrayite - Buckhornite series | |||
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 -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 Montbrayite using: Visit our Advertisers for Montbrayite : Translate Montbrayite Mineral Data : Ask about Montbrayite here : Print or Cut-and-Paste your Montbrayite Specimen Label here :
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