Supergene Pb-Cu-(Sb) mineral assemblage in abandoned epithermal deposit Rudno nad Hronom, Slovakia

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Marco E. Ciriotti
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Supergene Pb-Cu-(Sb) mineral assemblage in abandoned epithermal deposit Rudno nad Hronom, Slovakia

Messaggio da Marco E. Ciriotti » ven 24 set, 2021 20:03

Referenza:
▪ Vlasáč, J., Mikuš, T., Ondrejka, M., Tuček, P. (2021): Supergene Pb-Cu-(Sb) mineral assemblage in abandoned epithermal deposit Rudno nad Hronom, Slovakia. Acta Geologica Slovaca, 13, 107-118.

Abstract:
An unusual assemblage of Pb-Cu-(Sb)-(Mn) supergene minerals, represented by mottramite, phosphohedyphane, mimetite, minerals of the segnitite-beudantite series, anglesite, cerussite, oxyplumboroméite, brochantite, devilline, gypsum and coronadite was recently identified at the Priečna, Johan de Deo and Anna-Zubau epithermal ore veins near Rudno nad Hronom, Štiavnické vrchy Mts., Slovak Republic. Mottramite is a rare mineral at the Rudno deposit and this is the first reported occurrence in the Western Carpathians. Also phosphohedyphane occurs only rarely at the deposit. The Pb 2+ <-> Ca 2+ substitution between phosphohedyphane and pyromorphite was observed. An extensive substitution between As and S was recognised on the T site in the minerals of the beudantite-segnitite series. Anglesite and cerussite are relatively abundant supergene minerals, especially in the proximity of primary galena relicts. Secondary Cu sulphates (brochantite and devilline) are only secondary minerals found also in macroscopic size. Brochantite forms dark green tabular crystals up to 0.1 mm. Devilline occurs as a light green-blue acicular crystals grown on brochantite. Gypsum was found with this assemblage. Rare coronadite, Mn supergene mineral is also found at the Rudno nad Hronom locality.
Marco E. Ciriotti

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