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Cymraeg

Ktenasite

Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence
Distribution: Rare
Chemical Composition: Copper zinc sulphate hydroxide hydrate
Chemical Formula: (Cu,Zn)5(SO4)2(OH)6.6H2O
Method(s) of Verification: Ystrad Einion Mine - XRD (Natural History Museum, London).

Chemical Group:

Geological Context:

Green tabular ktenasite microcrystal from Ystrad Einion Mine. Specimen and photo S.A. Rust. © S.A. Rust.
Scanning electron micrograph of thin platy ktenasite crystals from Ystrad Einion Mine. Scale bar 200 microns (0.2 mm). National Museum of Wales Collection (NMW 90.14G.M.250). © National Museum of Wales.
Scanning electron micrograph of platy ktenasite crystal aggregates from Ystrad Einion Mine. Scale bar 200 microns (0.2 mm). National Museum of Wales Collection (NMW 90.14G.M.250). © National Museum of Wales.
Introduction: ktenasite is an extremely rare secondary mineral that forms in the oxidized zone of copper- and zinc-bearing ore deposits and within post-mining environments.
Occurrence in Wales: ktenasite forms part of the post-mining suite of supergene secondary minerals discovered within broken veinstone used as backfill, underground in Ystrad Einion Mine and reported by Mason & Rust (1997). Similar environments have been observed at a number of mines in the Central Wales Orefield, but ktenasite remains illusive to all but that one locality.

Key Localities:

There are no key localities for this specimen.

References:

  1. Bevins, R.E., 1994. A Mineralogy of Wales National Museum of Wales, Geological Series No. 16, Cardiff, 146pp.
  2. 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.

There are no references for this specimen.