Antipinite

antipinite

chanabayaite

joanneumite

salammoniac

Images

Formula: KNa₃Cu₂(C₂O₄)₄
Oxalate [containing (C₂O₄)^2- groups]
Crystal System: Triclinic
Specific gravity: 2.53 measured, 2.549 calculated
Hardness: 2
Colour: Blue
Luminescence: No fluorescence under UV
Environments

Cave deposits

Localities

At the type locality, Pabellón de Pica, Chanabaya, Iquique Province, Tarapacá, Chile, antipinite is found in a guano deposit. Associated minerals are halite, salammoniac, chanabayaite, joanneumite and clays. Antipinite occurs as blue, imperfect, short prismatic crystals up to 0.1 mm × 0.1 mm × 0.15 mm³ in size, as well as their clusters and random aggregates (MM 79.1111-1121).
Antipinite occurs as a secondary mineral with guano as the source of oxalate groups and oxidised chalcopyrite, from underlying gabbro, as the source of copper (HOM).

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