Tarapacaite
(repeating unit)K2(CrO4) Strunz classification 7.FA.05 Dana classification 35.2.1.1.1 Anhydrous chromates Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnam (no. 62) Identification Color Bright yellow, yellow-orange Crystal habit Thick tabular Cleavage Distinct/good
On {001} and {010}, distinct Diaphaneity Transparent Specific gravity 2.735 Solubility Soluble in water Other characteristics Health risks: contains the carcinogenic and mutagenic chromate ion References [1]
H-M symbol: (2/m 2/m 2/m)
On {001} and {010}, distinct
Tarapacáite is the mineral form of potassium chromate with the chemical formula K2CrO4. It forms bright yellow crystals and was discovered in 1878. It is named for the former Tarapacá Province, Peru; nowadays belonging to Chile. The boundaries between Peru, Bolivia and Chile were vague in the Atacama Desert before the War of the Pacific (1879–1883). Its type locality is Oficina Maria Elena, Maria Elena, Tocopilla Province, Antofagasta Region, Chile. It is unlikely to occur anywhere except in highly arid conditions as it is easily soluble in water.[1][2][3]
References
- v
- t
- e