Abstract

BRODTKORB, M.K. de  and  PAAR, W.. Angelaite in the paragenesis of Los Manantiales district, Chubut, Argentina: a new mineral species. Rev. Asoc. Geol. Argent. [online]. 2004, vol.59, n.4, pp.787-789. ISSN 0004-4822.

Angelaíte Cu₂AgPbBiS₂, a new mineral species, occurs in Mina Ángela, an IS type mineralization at the Los Manantiales district. The assemblage contains sphalerite, pyrite, chalcopyrite, galena with numerous inclusions of angelaíte, aikinite, miharaíte, and in smaller amounts arsenopyrite, betekhtinite, bornite, matildite, gold, silver, electrum, tellurium cervelleíte and hematite. Galena presents numerous inclusions of angelaíta, aikinita, wittichenita y miharaíta. This paragenesis occurs in veins associated with different volcanic rocks of the jurassic Lonco Trapial Formation. Angelaíte was observed as anhedral grains of 10-100mm, greenish grey in colour, moderately pleochroic and anisotropic.

Keywords : Angelaite; Ángela mine; Chubut; Argentina.

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