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A dark-grey, almost black, copper bearing mineral, somewhat resembling Redruthite in general appearance, but of a duller lustre and considerably harder; the hardness being between 5 and 6. In parts a bronze tint and lustre is apparent. The specimen exhibits neither crystals nor crystalline structure, it breaks with a well marked couchoidal fracture. Lustre somewhat resinous; streak shining. Heated in a glass tube it gives off water, having a strongly marked acid reaction, from the sulphurousdoi:10.1180/minmag.1882.005.22.03 fatcat:rsan3icjnvbgdebavkbbh6wofa