Mineralogy Database

Montbrayite Mineral Data

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General Montbrayite Information

Help on Chemical  Formula: Chemical Formula: (Au,Sb)2Te3
Help on Composition: Composition: Molecular Weight = 739.12 gm
   Antimony    8.24 %  Sb
   Tellurium  51.79 %  Te
   Gold       39.97 %  Au
             100.00 % 
Help on Empirical Formula: Empirical Formula: Au1.5Sb0.5Te3
Help on Environment: Environment: Found with other tellurides, sulfides, and gold in coarsely crystalline masses. Also found rimming gold grains.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1946
Help on Locality: Locality: Robb-Montbray mine, Montbray, Abitibi County, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Name for the locality.
Help on Name Pronunciation: Name Pronunciation: Montbrayite + Pronunciation Say MONTBRAYITE
Help on Synonym: Synonym: ICSD 23594
  PDF 25-364

Montbrayite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8989:1:0.8023
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.09(1), 2.93(0.8), 2.98(0.8),

Physical Properties of Montbrayite

Help on Cleavage: Cleavage: {110} Distinct, {011} Distinct, {111} Distinct
Help on Color: Color: Yellowish white, Light yellow, Tin white.
Help on Density: Density: 9.94
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: white

Optical Properties of Montbrayite

Help on RL Anisotrophism: RL Anisotrophism: Weak to moderate, light gray, yellow-brown, and blue-gray.
Help on RL Pleochroism: RL Pleochroism: Very weak.

Calculated Properties of Montbrayite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.57 gm/cc
note: Specific Gravity of Montbrayite =9.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEMontbrayite = 895.39 barns/electron
U=PEMontbrayite x rElectron Density=6,781.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montbrayite is Not Radioactive

Montbrayite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.11)where Am Bn Xp, with (m+n):p=2:3
  (02.11.08)Dana Group Montbrayite (Au,Sb)2Te3 P1 1
Help on  Strunz Class: Strunz Class: 02.DB.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.D - Metal Sulfides, M:S = 3:4 and 2:3
  02.DB -M:S = 2:3 and similar
02.DB.20 Montbrayite (Au,Sb)2Te3 P1 1

Other Montbrayite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 02.DB.20





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