Ángelaite, Galena
Angela mine, Los Manantiales mining district, Gastre Department, Chubut Province, Argentina
Tiny grains of angelaite embedded in galena. Because of the mineral's extreme anisotropy, it ranges from bright white (2 middle arrows) to brownish grey (top and bottom arrows) in polarized light. In reflected light, it is barely distinguishable from surrounding galena. Identifications by EDS and ore microscopy. Excalibur Mineral Corporation ...
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