Hillite
Hillite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₂Zn(PO₄)₂·2H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Fairfieldite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.16; Vitreous; silky aggregates luster; optically biaxial.
IMA symbol Hi, IMA status: approved, named in 2003.
Found in a gossan developed on argillaceous siltstone.
It is found associated with Zincian collinsite, scholzite.
The mineral was named to honor Dr. Roderick Hill (b. 1949) Chief of the Mineral Research Division, CSIRO at Melbourne, Australia, who described the mineral in 1973 as a potentially new species.
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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