Minerals
Sanmartinite
sanmartinite
ZnWO4
Sanmartinite archived mineral specimens — via www.dakotamatrix.com · Source
Overview
Sanmartinite is a rare tungstate mineral with the ideal chemical formula ZnWO4. It is the zinc analogue of ferberite, FeWO4, and hübnerite, MnWO4, and belongs to the wolframite group. Sanmartinite crystallizes in the monoclinic crystal system. It has only been found as fibrous to fine-grained masses and as microscopic tabular crystals up to about 60 μm in size.
Identification characteristics
- Mohs hardness 5