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Umangite: Cu3Se2 Tyrrellite: (Cu,Co,Ni)3Se4
Comments: Bright metallic partial cubic tyrrellite crystal in altering umangite. Location: Eagle Claims, near Hal Lake, Beaverlodge, Saskatchewan, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Umangite: Cu3Se2 Berzelianite: Cu2Se
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
Umangite: Cu3Se2 Athabascaite: Cu5Se4 Berzelianite: Cu2Se
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