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Mineralpedia Details for Berzelianite

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Berzelianite

Berzelianite

Named in honor of noted Swedish chemist and mineralogist Jons Jacob Berzelius, who discovered the element selenium which is an important component of the mineral. A rare but wide spread mineral that occurs in localities in Sweden, Germany, the Czech Republic, Uzbekistan, Argentina, Brazil, Sumatra, Australia, Canada, and the United States. It can be found in occurrence with other selenides in hydrothermal veins and calcite veins, and in gold-quartz deposits. Associated with eucairite, clausthalite, tiemannite, umangite, klockmannite, aguilarite, crookesite, athabascaite, stromeyerite, polybasite, pearceite, gold, uraninite, pyrite, marcasite, and calcite.

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

Formula
Cu2-xSe (x~0.12) 
Crystal System
Isometric 
Crystal Habit
Dendritic, Disseminated, Massive 
Cleavage
None, None, None 
Luster
Metallic 
Color
bluish gray, gray, black 
Streak
shining 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
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Berzelianite from Skrikerum mine, Valdemarsvik, Östergötland, Sweden

Berzelianite
            from Skrikerum mine, Valdemarsvik, Östergötland, Sweden

Extremely rich inclusion of black Berzelianite in Calcite matrix.

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Berzelianite from Bukov mine, Rožná deposit, Vysočina, Moravia, Czech Republic

Berzelianite
            from Bukov mine, Rožná deposit, Vysočina, Moravia, Czech Republic

Black metallic, tarnished coatings and inclusions in Calcite and fine, thin silveryflakes within matrix.

Click thumbnail images for larger view.

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