Barquillite
Barquillite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₂(Cd,Fe)GeS₄.
It crystallizes in the tetragonal crystal system (space group I-42m). It is a member of the Sphalerite, Stannite structural group.
Key properties: Mohs hardness 4–4.5; specific gravity 4.53; Metallic luster; optically uniaxial.
IMA symbol Bql, IMA status: approved, named in 1996.
Very rare, in a hydrothermal Sn-Ge-Cd-Cu-Fe vein deposit.
It is found associated with Tetrahedrite, greenockite, chalcopyrite, bornite, mawsonite, stannite, stannoidite, mohite, digenite, sericite.
The name refers to the village of Barquilla, Spain, near the type locality.
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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