Formula: K2CrO4
Origin of name: after locality Tocopilla Pampa, Tarapacá Province, Chile
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: As pseudohexoganl trillings on {011}
Unit cell: a = 7.663, b = 10.391, c = 5.919
Colour: Bright canary yellow, light yellow
Diaphaneity: Transparent
Luster: Vitreous
Habit: crystals thick tabular, typically disseminated granular
Hardness:
Specific gravity: 2.74 (synthetic
Cleavage: 2; {001} and {010} distinct
Tenacity:
Streak: Light yellow
Synonyms/varieties:
Comments: soluble in water
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