Tarapacáite
Tarapacáite is an IMA-recognized mineral species in the chromate class, with the chemical formula K₂(CrO₄).
It crystallizes in the orthorhombic crystal system (space group Pmcn).
Key properties: specific gravity 2.74; optically biaxial.
IMA symbol Tpc, grandfathered status — known before the IMA’s founding, named in 1878.
A minor accessory mineral in nitrate deposits.
It is found associated with Lopezite, dietzeite.
The name refers to its first noted occurrence in the Tocopilla Pampa, 170 km north of Antofagasta, Tarapacá, Chile.
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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