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Montbrayite

Formula:
(Au,Sb)
 
2
Te
 
3
System:TriclinicHardness:2½
This page provides mineralogical data about Montbrayite.

Classification of Montbrayite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.15-10
Nickel-Strunz 10th (pending) edition ID:2.DB.20

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
B : M:S = 2:3
Dana 8th edition ID:2.11.8.1

2 : SULFIDES
11 : AmBnXp, with (m+n):p = 2:3
Hey's CIM Ref.:3.3.14

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
3 : Sulphides etc. of Au
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Type Occurrence of Montbrayite

Type Locality:Robb-Montbray Mine, Montbray Township, Abitibi Co., Québec, Canada
Year of Discovery:1945

Physical Properties of Montbrayite

Hardness (Mohs):2½

Crystallography of Montbrayite

Crystal System:Triclinic
Cell Parameters:a = 12.11Å, b = 13.44Å, c = 10.8Å
α = 104.38°, β = 97.5°, γ = 107.93°
Ratio:a:b:c = 0.901 : 1 : 0.804
Unit Cell Volume:V 1,578.64 ų (Calculated from Unit Cell)

Chemical Properties of Montbrayite

Formula:
(Au,Sb)
 
2
Te
 
3
Essential elements:Au, Te
All elements listed in formula:Au, Sb, Te
Common Impurities:Ag,Pb,Bi,S

Relationship of Montbrayite to other Species

Related Minerals - Nickel-Strunz Grouping):
2.DB.05Antimonselite
Sb
 
2
Se
 
3
2.DB.05Bismuthinite
Bi
 
2
S
 
3
2.DB.05Guanajuatite
Bi
 
2
(Se,S)
 
3
2.DB.05Metastibnite
Sb
 
2
S
 
3
2.DB.05Pääkkönenite
Sb
 
2
AsS
 
2
2.DB.05Stibnite
Sb
 
2
S
 
3
2.DB.10Ottemannite
beta Sn
 
2
S
 
3
2.DB.10Suredaite
PbSnS
 
3
2.DB.15Bowieite
(Rh,Ir,Pt)
 
2
S
 
3
2.DB.15Kashinite
(Ir,Rh)
 
2
S
 
3
2.DB.25Edgarite
FeNb
 
3
S
 
6
2.DB.30Tarkianite
(Cu,Fe)(Re,Mo)
 
4
S
 
8
2.DB.35Cameronite
AgCu
 
7
Te
 
10
Related Minerals - Hey's Index Grouping:
3.3.1Calaverite
AuTe
 
2
3.3.2Krennerite
(Au,Ag)Te
 
2
3.3.3Kostovite
CuAuTe
 
4
3.3.4Uytenbogaardtite
Ag
 
3
AuS
 
2
3.3.5Fischesserite
Ag
 
3
AuSe
 
2
3.3.6Petrovskaite
AuAg(S,Se)
3.3.7Petzite
Ag
 
3
AuTe
 
2
3.3.8Muthmannite
(Ag,Au)Te
3.3.9Sylvanite
(Au,Ag)
 
2
Te
 
4
3.3.10Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
3.3.11Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
3.3.12Bilibinskite
PbCuAu
 
3
Te
 
2
3.3.13Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)

Other Names for Montbrayite

German names:
Montbrayit
Spanish names:
Montbrayita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Montbrayite

Reference List:American Mineralogist (1946): 31: 515-526.

American Mineralogist (1972): 57: 146-154.

Internet Links for Montbrayite

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  • Raman and XRD data at RRUFF project
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  • Search for Montbrayite in the Natural History Museum (London) online catalogue
  • Montbrayite details from Handbook of Mineralogy (PDF)
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    Localities for Montbrayite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Western Australia
      • Kalgoorlie
    		Canadian Mineralogist (2003) 41, 1503-1524
    Canada
     
    • Québec
      • Abitibi Co.
        • Montbray Township
    Finland
     
    • Itä-Suomen Lääni
      • Ilomantsi
    		No reference listed
    Mexico
     
    • Sonora
      • Mun. de Moctezuma
    		Lapis 2001(1), 11-40
    Sweden
     
    • Hälsingland
      • Ljusdal
    		No reference listed
    USA
     
    • Nevada
      • Lincoln Co.
    		Rocks & Minerals, Nov. 1999
    NBMG Spec. Pub. 31 Minerals of Nevada
    Mineral and/or Locality
    Google
     
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