Dundasite

Dundasite


Composition: PbAl2(CO3)2(OH)4.H2O
Crystal System : Orthorhombic
Colours: Colourless, white, pale blue, sky-blue
Lustre : Vitreous, silky
Hardness (H) : 2
Specific Gravity (S.G) : 3.10-3.55
References: Keller (1977a)

Distribution

Rare. The frequent association with azurite suggests that dundasite was primarily a first oxidation zone mineral. However, Von Bezing et al. (2014) attribute dundasite primarily to the second oxidation zone.

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone

Paragenetic and General Notes

Keller (1977) places dundasite in one of his "Type I" parageneses (i.e. mineral sequences forming at higher pH ranges):

Duftite >> dundasite >> cerussite >> azurite >> malachite (ps. azurite).