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The Canadian Mineralogist; May 1984; v. 22; no. 2; p. 219-226
© 1984 Mineralogical Association of Canada
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Tintinaite et sulfosels associes de Tintina (Yukon); la cristallochimie de la serie de la kobellite

Yves Moelo, John L. Jambor, and Donald C. Harris

Cent. Rech. Synth. et Chim. Miner., Orleans, France
CANMET, Canada
Comm. Geol. Can., Canada

Re-examination of the tintinaite-kobellite series has shown that tintinaite contains 2.1 wt. % Cu and has the formula Pb (sub 10.6) Sb (sub 15.3) Cu (sub 1.8) Ag (sub 0.2) S (sub 34.5) (D 5.65 g/cm 3 ), or, more simply, Pb 11 Sb 15 Cu 2 S (sub 34.5) . Miehe's (1971) structural formula for kobellite has been re-examined; we conclude that Fe and Cu in tintinaite-kobellite have different structural roles; incorporation of Cu is envisaged as following the scheme (Bi,Sb) (super 3+) --> Pb (super 2+) + Cu (super +) , thus implying a mixed Pb-(Bi,Sb) site. Jamesonite and robinsonite coexisting with tintinaite are devoid of Cu; associated epitactic growths of "mineral JC" (Pb 2 CuSb 3 S 7 ) on jamesonite suggest that each 6-coordinated Fe atom in jamesonite was replaced by two Cu atoms with 4-fold coordination. "Mineral JC" is a low-temperature phase derived by alteration in which both jamesonite + tintinaite contribute essential elements. Minor amounts of Cu incorporated in a specific tetrahedral site is thought to stabilize some Pb sulfosalts at low temperatures; examples are meneghinite, tintinaite, and probably also launayite Pb 10 Sb,As) 12 CuS 30 and sorbyite Pb 9 Sb 9 As 2 CuS 26 .--Modified journal abstract.

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