Ángela mine, Los Manantiales mining district, Gastre Department, Chubut Province, Argentina

Reflected light digital image illustrating R1 of angelaite (ang), slightly brownish light grey against galena (gn) and chalcopyrite (cpy). Horizontal field of view ~ 200 microns

© Natural History Museum

Reflected light digital image illustrating R2 of angelaite (ang),light cream with a greenish tint against galena (gn) and chalcopyrite (cpy). Note some small brownish grains which show weak to no bireflectance. These could be miharaite or wittichenite. Horizontal field of view ~ 200 microns See Topa D et al. 2010. Can. Min. 48: 139-144.

© Natural History Museum

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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