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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