Mineral description : Tsumoite

Tsumoite from Björkdal gold mine.
As small silvery flakes in quartz.

Mineral class Sulphides : Tetradymite group
Chemical formula BiTe
Crystal system Trigonal
Habitus  
Cleavage  
Hardness  
Density 8.16
Color Silvery white
Streak  
Luster Metallic, with a frosted look.
Description  
Occurance  
Associates  
Notes Named after the type locality Tsumo mine in Japan.
First publication in American Mineralogist 63 (1978), pg 1162-1165, by Shimazaki H and Ozava T.
Locations
  • Björkdal gold mine. As light gray frosted aggregates, as dark gray flakes or as small silver colored grains with tourmaline or chacopyrite.
  • Tunaberg, Jönköping. See article in European journal of mineralogy 1993, jan-feb, pg 165 (ISSN 0935-1221).
  • West of the Jokisivu village, Huittinen. Together with gold.
  • Tsumo mine, Japan.
  • Tyrong Auz (Tyrnyauz), Caucasus Mountains, U.S.S.R.

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Last changed : 1998-07-30