Beudantite

Beudantite


Composition: PbFe3+3(As0.5S0.5O4)2(OH)6
Crystal System : Trigonal
Colours: Greenish-yellow, yellow, brown, reddish-brown, reddish-orange, red, very dark red.
Lustre : Vitreous, sub-vitreous, resinous
Hardness (H) : 3.5-4.5
Specific Gravity (S.G) : 4.48
References: Gebhard (1999)

Distribution

Rare. Very rare in the upper levels of the mine; most specimen material is from the second oxidation zone.

Occurrence

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

Notable Finds

A small vug in the second oxidation zone, discovered in the early 1980s, contained crystals of beudantite (to 5 mm) on lepidocrocite (Gebhard, 1999).

Paragenetic and General Notes

Gutzmer and Cairncross (2001) described germanium-rich beudantite containing up to 6.5% Ge that was mined during the 1970s. Re-analysis of some beudantite specimens has shown them to be segnitite (Gebhard, 1999).