Chemistry:Berzelianite

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Berzelianite
Berzelianite, Calcite-361052.jpg
Berzelianite included in calcite from the Skrikerum mine in Sweden.
General
CategorySelenide minerals
Formula
(repeating unit)
Cu2Se
Strunz classification2.BA.20
Dana classification2.4.10.1
Crystal systemIsometric
Identification
ColorSilvery white, tarnishes easily
Crystal habitDendritic crusts, fine-grained inclusions
CleavageNone
FractureUneven
TenacitySlightly malleable
Mohs scale hardness2.7
|re|er}}Metallic
StreakShining
DiaphaneityOpaque
Density6.71 (measured) 7.28 (calculated)
Ultraviolet fluorescenceNone
Common impuritiesAg
References[1][2][3]

Berzelianite is a rare copper selenide mineral with the formula Cu2Se.[1][2][3] It occurs as thin dendritic crusts or as fine-grained inclusions. It crystallizes in the isometric system,[4][5][6] unlike its dimorph, bellidoite, which crystallizes in the tetragonal system.[7] The crystals are opaque and slightly malleable.

Occurrence and name

Berzelianite was first identified at the Skrikerum Mine (also spelled as Skrickerum Mine) in Valdemarsvik, Östergötland, Sweden in 1850.[5]

It was named by James Dwight Dana to honor Jöns Jakob Berzelius, a Swedish chemist who is seen as the father of analytical chemistry. He invented chemical symbol notation and discovered the elements cerium, selenium, silicon, and thorium.[5]

Berzelianite often occurs together with eucairite, clausthalite, tiemannite, umangite, klockmannite, aguilarite, crookesite, athabascaite, stromeyerite, polybasite, pearceite, gold, uraninite, pyrite, marcasite, calcite.

See also

References