Albite


Composition: NaAlSi3O8
Crystal System : Triclinic
Colours: White
Lustre : Vitreous
Hardness (H) : 6.0-6.5
Specific Gravity (S.G) : 2.60-2.65

Distribution

Rare. Between 12 and 18 levels in the dolostone country rock. Widespread in feldpathic sandstone ("pseudo-aplite") bodies in the Tsumeb pipe.

Occurrence

  • Country Rock

Paragenetic and General Notes

Albite crystals, as a late diagenetic mineral, are disseminated in dolostone and limetone in horizons interpreted to be of evaporitic origin, between 12 and 18 levels (Hughes 1987).

Albite also occurs as a detrital mineral in the feldpathic sandstone ("pseudo-aplite") derived from the Tschudi Formation (Lombaard et al., 1986).