Gallite


Composition:

CuGaS2

Crystal System : Tetragonal
Colours: Grey
Lustre : Metallic
Hardness (H) : 3.0-3.5
Specific Gravity (S.G) : 4.20
Year of Discovery: 1958
IMA Number: Grandfathered
IMA Status: Approved

 

Distribution

Rare. Sparse, but widespread, mainly as microscopic inclusions in Ge- and Ga-enriched sulphide ores.

Occurrence

  • Hypogene

Paragenetic and General Notes

The first mineral described with essential gallium. According to some sources (e.g. www.mindat.org) Tsumeb shares type locality status with Kipushi, in the D.R.Congo; however, the IMA listing credits only Kipushi in this regard.

Gallite occurs most commonly as microscopic lamellae in sphalerite that is associated with germanite (Ramdohr, 1980). Also as grey metallic grains in the germanite itself (Keller, 1977). Note that these textures are only visible in polished section, by means of reflected light microscopy.