An unusual assemblage of supergene minerals near Coppin Pool, Western Australia
Titel:
An unusual assemblage of supergene minerals near Coppin Pool, Western Australia
Auteur:
Nickel, E. H.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 32 (1985) nr. 3 pagina's 311-321
Jaar:
1985-09
Inhoud:
A pocket of sulphides in a quartz vein has been altered to a complex supergene assemblage that includes the known minerals anglesite, cerussite, phosgenite, pyromorphite, vanadinite, mottramite, covellite, chalcocite, cuprite, tenorite, malachite, rosasite, stromeyerite and cinnabar. Less well characterized variants of known minerals include an amorphous lead-manganese hydroxide that may be a precursor of coronadite, a hydrated copper sulphide that may be a precursor of covellite, and a covellite-like mineral that contains up to 21.6% Pb, 9.3% Ag and 7.1% Cl. Six new minerals in the assemblage include two copper-lead chloride-sulphides, two copper-silver sulphides, a silver-mercury sulphide, and a sulphide-halide of silver and mercury. Pseudomorphic textures derived from the progressive replacement of galena are well developed in the early stages of the alteration, and some chalcopyrite boxwork textures have been retained.
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