Segnitite

Segnitite


Composition: PbFe3+3H(AsO4)(AsO3(OH)(OH)6
Crystal System : Trigonal
Colours: Yellowish-brown, greenish-brown
Lustre : Adamantine
Hardness (H) : 4
Specific Gravity (S.G) : 4.7
References: Gebhard (1999)

Distribution

Very rare. Second oxidation zone.

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Segnitite occurs as brown irridescent crystals, to 5 mm, and is visually indistinguishable from beudantite; analysis is therefore required for verification.

It was first identified at Tsumeb on material from the collection of John Innes, associated with spherules of acicular olivenite and emerald-green crystals of duftite. This characteristic paragenesis is helpful in distinguishing it from beudantite.