Plumbojarosite

Crystal System: Trigonal
Status of Occurrence: Unconfirmed Occurrence
Distribution: Rare
Chemical Composition: Lead iron sulphate hydroxide
Chemical Formula: PbFe63+(SO4)4(OH)12
Method(s) of Verification: Ystrad Einion Mine - not fully verified. XRD of a beaverite specimen at the Natural History Museum, London indicated a little plumbojarosite may be present (Wirth, 1993).

Geological Context:

  • Supergene: post-mining oxidation & weathering deposits
Introduction: a secondary sulphate belonging to the alunite group of minerals. Plumbojarosite is common in the oxidized zone of lead mines in arid regions.
Occurrence in Wales: tentatively identified from Ystrad Einion Mine in the Central Wales Orefield on the basis of contamination in beaverite analysed at the Natural History Museum, London (Wirth, 1993). However, Mason & Rust (1997) give no mention of plumbojarosite in their detailed review of the mineralogy of Ystrad Einion Mine thus, suggesting that the original record has been discredited.

Key Localities:

  • Ystrad Einion Mine, Furnace, Ceredigion: noted during XRD analysis as a possible associate with beaverite (Wirth, 1993). No further details are recorded, other than that a piece of this material is in the British Micromount Society reference collection (No. 1326).

There are no key localities for this specimen.

References:

  1. Mason, J.S. & Rust, S.A., 1997. The Mineralogy of Ystrad Einion Mine, Dyfed, Wales. U.K. Journal of Mines and Minerals, 18, 33-36.
  2. Wirth, M., 1993. Recent additions (Nos. 1301-1400) to the BMS collection. British Micromount Society Newsletter, No. 35, 15-16.

There are no references for this specimen.