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Encyclopedia Britannica



TETRADYMITE

This article appears in Volume V26, Page 670 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: TAV-THE
TETRADYMITE , a
mineral
  consisting of bismuth telluride and sulphide, Bi2Te2S, also known as " telluric bismuth." Sometimes
sulphur
  is absent and the
formula
  is then Bi2Tea; traces of selenium are usually present. Crystals are rhombohedral, but are rarely distinctly developed; they are twinned together in groups of four; hence the name of the
mineral
 , from the
Greek
 , rerpaSupos, fourfold. There is a perfect cleavage parallel to the basal plane; and the mineral usually occurs in foliated masses of irregular outline. The colour is steel-grey, and the lustre metallic and brilliant. The mineral is very soft (H = 1) and marks
paper
 ; the specific gravity is 7.2 to 7.6. It was first found, in 1815, at Telemarken in Norway; crystals are from Schubkau near Schemnitz in
Hungary
 . It often occurs in
quartz
  associated with native gold. Other species very similar to tetradymite, but with different formulae, are: joseite, from San Jose near Marianna in Brazil; grunlingite (Bi,SaTe), from Caldbeck Fells in Cumber-
land
 ; and wehrlite, from
Hungary
 . (L. J. S.)


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