Mineral description : Djurleite

Mineral class	Sulphides : Chalcocite group
Chemical formula	Cu31S16
Crystal system	Monoclinic
Habitus	Short, prismatic and thick tabular, up to 1 cm. Twinning on {110} commonly. Often massive compact.
Cleavage
Hardness	2.5 - 3
Density
Color	Grayish blue to black.
Streak
Luster	Metallic, opaque.
Description
Occurance	In enrichmentzones of copper deposits.
Associates	Digenite, bornite, chalcopyrite, chalcosite, anilite, pyrite.
Notes	A mineral closely related to chacosite. Probably more commonly than current findings tell. Named after S. Djurle, who produced synthetic djurleite. Later it was also found naturally occuring.
Localities	A rare mineral Sweden : Långban, Värmland. In dolomite together with chalcosite, pyrite and metallic copper. Norway : Näsmark, Åmdals verk. Lillebotn, Tysfjord. In ore together with bornite, chalcopyrite and chalcosite. Finland : waiting for data.

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