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Coupled substitutions in goldfieldite–tetrahedrite minerals from the Iriki mine, Japan

Published online by Cambridge University Press:  05 July 2018

Masaaki Shimizu
Affiliation:
University Museum, University of Tokyo, Tokyo 113, Japan
Chris J. Stanley
Affiliation:
British Museum (Natural History), London SW7 5BD, U.K.

Abstract

Chemical compositions of goldfieldite-tetrahedrite series minerals from the Iriki mine in Japan are reported for the frst time. The compositional variations of coexisting goldfieldite [atomic proportion Te > (Sb + As + Bi)], tellurian tetrahedrite [Sb > (Te + As + Bi)], and Te-free tetrahedrite from this locality are considered alongside data from the literature. These show that the substitution of (Sb, As)3+ for Te4+ in natural goldfieldite-tetrahedrite series minerals occurs by the following two mechanisms: (i) tetrahedrite, and goldfieldite, form a continuous solid-solution according to the coupled substitution of Cu+Te4+ for (Cu,Fe,Zn)2+(Sb,As)3+, and (ii) goldfieldite, and the ideal end-member, might also form a continuous solid-solution by the coupled substitution of ☐(vacancy)Te4+ for Cu+(Sb,As)3+. According to this work, the general formulae of tellurian tetrahedrite and goldfieldite are, therefore, respectively, , with x = 0 to 2 and , with y = 0 to 2.

Type
Mineralogy
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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