Hedyphane

Hedyphane


Composition: Pb3Ca2(AsO4)3Cl
Crystal System : Hexagonal
Colours: Colourless, grey, white, brown, yellow, pale-blue
Lustre : Resinous, greasy
Hardness (H) : 4.5
Specific Gravity (S.G) : 5.82

Distribution

Very rare. Second and third oxidation zones.

Occurrence

  • Supergene
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

As small (1 mm) colourless, white, to greyish-white crystals on calcite "from the 860m level" (Pinch and Wilson, 1977). Tan coloured crystals to 30 mm with elongated epimorphs after mimetite (?) were found on 46 Level in 1994 (Gebhard, 1999). One unique specimen comprises hedyphane crystals with stolzite (Gebhard, op. cit.).

Paragenetic and General Notes

While hedyphane is a rare mineral at Tsumeb, it is easily overlooked as mimetite, after which it sometimes forms pseudomorphs.

Hedyphane is reported to form pseudomorphs after the following minerals: mimetite (rare).