Orthoclase


Composition: KAlSi3O8
Crystal System : Monoclinic
Colours: Colourless, white, grey, yellow, brown, pale-green
Lustre : Vitreous, pearly
Hardness (H) : 6
Specific Gravity (S.G) : 2.55-2.63

Distribution

Common. As a detrital mineral in the feldpathic sandstone ("pseudo-aplite") bodies, derrived from sediments of the Tschudi Formation.

Occurrence

  • Country Rock