Alamosite

Alamosite


Composition: PbSiO3
Crystal System : Monoclinic
Colours: Colourless, white, grey, cream
Lustre : Adamantine, sub-adamantine
Hardness (H) : 4.5
Specific Gravity (S.G) : 6.5
References: Keller (1977a)

Distribution

Very rare. First recognised from the second oxidation zone, in the 1970s (Gebhard, 1999).

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Notable Finds

Radiating, colourless-to-white sprays of elongated crystals from the second oxidation zone are considered to be best of species. According to Von Bezing et al. (2014), some 60-80 specimens were recovered from this find. The crystals were at first mistaken for aragonite.

Paragenetic and General Notes

Part of a rare paragenesis with kegelite, melanotekite, anglesite and leadhillite.

Keller (1977) recognises the following "rare mineral paragenesis": primary sulphides >> wulfenite >> alamosite >> kegelite >> leadhillite >> cerussite.