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Mineralpedia Details for Eugenite

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Eugenite

Eugenite

Named for Professor Eugen Friedrich Stumpfl, an Austrian mineralogist at the Mining University in Leoben, Austria, to honor his work on noble metal compounds. Eugenite is a rare mineral that can be found in cuprite and in low-grade copper sulfide ores in shales and carbonate rocks. Localities for Eugenite include notably in Poland, and the United States, with a few other known localities. Eugenite can be found in association with chalcocite, covellite, tennantite, hematite, calcite, ankerite, and gypsum.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/eugenite.pdf

Formula
Ag11Hg2 
Crystal System
Isometric 
Luster
Metallic 
Color
silver white 
Streak
metallic 
Class
Isometric - Hextetrahedral 
Hardness
2.5-3 
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Eugenite from Los Bordos mine, Elisa de Bordos, Copiapo, Atacama, Chile

Eugenite
            from Los Bordos mine, Elisa de Bordos, Copiapo, Atacama, Chile

Silvery, malleable thin veinlets on matrix.

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