Huenite

huenite

lindgrenite

gypsum

tourmaline

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Formula: Cu4(MoO4)3(OH)2
Sulphate, molybdenum-bearing mineral
Specific gravity: 5.1 calculated
Hardness: 3½ to 4
Streak: Pale reddish brown to pinkish
Colour: Very dark reddish brown
Luminescence: Non-fluorescent under 254 nm (short wave) and 366 nm (long wave) UV
Environments

Hydrothermal environments

Localities

At the type locality, the San Samuel mine, Carrera Pinto, Cachiyuyo de Llampos mining district, Copiapó, Copiapó Province, Atacama, Chile, huenite and lindgrenite are oxidation products of primary copper sulphide minerals in a body of brecciated quartz porphyry enriched in molybdenite and copper sulphides (mainly djurleite).
The primary sulphides were mineralised by late-stage hydrothermal fluids as open-space fillings. The porphyry bodies have been prospected and mined for copper, gold and tungsten.
Huenite occurs as small orthorhombic prisms (60–70 microns long) perched on the surfaces of brittle fractures in the quartz breccia, in close association with lindgrenite, gypsum and tourmaline (CM 57.467-474, HOM).

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