Dervillite
Dervillite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₂AsS₂.
It crystallizes in the monoclinic crystal system (space group P2/a). It is a member of the Dervillite structural group.
Key properties: specific gravity 5.62.
IMA symbol Dvl, IMA status: approved, named in 1941.
Found in a Co–Ni–Fe–As deposit.
It is found associated with Arsenic, rammelsbergite, safflorite, proustite, calcite, quartz.
The name refers to Dr. Henri Derville, French paleontologist, Strasbourg University, Strasbourg, France, who noted the original specimen.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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