Luzonite


Composition: Cu3AsS4
Crystal System : Tetragonal
Colours: Dark pinkish-brown
Lustre : Metallic, dull
Hardness (H) : 3.5
Specific Gravity (S.G) : 4.47
References: Strunz et al. (1958a)

Distribution

Very rare. As microscopic inclusions in sulphide ores, but as crystals in the third oxidation zone.

Occurrence

  • Hypogene

Notable Finds

Numerous twinned crystals of luzonite on a 30 x 0 mm crystal of germanite were found in the third oxidation zone, probably from 45 Level. This is the only known occurrence of luzonite crystals at Tsumeb.

Paragenetic and General Notes

Luzonite is the tetragonal dimorph of enargite.

Bartelke (1976) described yellowish to steel-grey inclusions in sulphide ores.