1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
TETRAHEDRITE, a mineral consisting typically of copper sulph-antimonite, CujSbSj, but often of complex composition. The copper is usually isomorphously replaced by variable amounts of silver, iron, zinc, mercury, lead or cobalt, and the antimony by arsenic or bismuth. In general, the formula is R'6X2S6-|-*R''eX2S9, where R'=Cu, Ag; X=Sb, As, Bi; R* = Fe, Zn, and x is a small fraction, often ^ or £. Numerous special names have been applied to varieties differing in chemical composition; the arsenic compound, CujAsSj…
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- Vol. 26, pp. 670-671