Mineral Information and Data:

Tarapacaite
K2CrO4 [CNMNC approved formula]

Named for its first noted occurrence in the Tocopilla Pampa, 170 km north of Antofagasta, Tarapaca, Chile.

IMA status : Valid species (Pre-IMA 1878) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
35.01.01.01  
  (35) Anhydrous Chromates
  (35.01) where (A+)2 XO4
  (35.01.01)
  
Nickel-Strunz
(10th edition) :
07.FA.05
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.F) Chromates
  (07.FA) Without additional anions
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: H2O Soluble.

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