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Berzelianite: Cu2Se Umangite: Cu3Se2
Comments: Black massive umangite intergrown with dark blue metallic berzelianite. Location: Borsov, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Berzelianite: Cu2Se Athabascaite: Cu5Se4 Umangite: Cu3Se2
Comments: Reflected light photomicrograph of umangite (pinkish), berzelianite (gray), athabascaite (small white areas in berzelianite), calcite (olive). Location: Sierra de Umango, La Rioja, Argentin. Scale: Not Given. © Jeff Weissman / Photographic Guide to Mineral Species
Berzelianite: Cu2Se Bellidoite: Cu2Se
Comments: Dark bellidoite inclusions in black berzelianite with white calcite. Location: Habri, near Tisnov, Jihomoravsky, Czech Republi. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Berzelianite: Cu2Se
Comments: Blue-black metallic massive berzelianite. Location: Bukov, Western Moravia, Severocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Berzelianite: Cu2Se Novakite: (Cu,Ag)21As10
Comments: Gray metallic dendritic novakite in white calcite with tarnished black berzelianite. Location: Cerny Dul, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species