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Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence
Distribution: Rare
Chemical Composition: Lead oxysulphate
Chemical Formula: Pb2(SO4)O
Method(s) of Verification: Dolyhir Quarry - XRD; Eaglebrook Mine - visual identification; Frongoch Mine - XRD (Oxford University Museum) & EMPA.

Geological Context:

Lanarkite (white) within oxidized tennantite-galena-bearing veinstone. Dolyhir Quarry, Old Radnor, Powys. Photo D.I. Green, © D.I. Green.
A divergent spray of bladed lanarkite crystals from Frongoch Mine. Individual crystals to 2.5 mm in length. Steve Rust specimen and photo. © Steve Rust.
Introduction: lanarkite is a rare secondary lead mineral formed through the alteration of primary lead minerals both within the oxidized upper levels of hydrothermal veins and within mine spoil.
Occurrence in Wales: lanarkite was first recorded in Wales by Mason (1994), as part of an extensive partly dump-formed supergene assemblage at Frongoch Mine in the Central Wales Orefield. Microcrystals have since been described from Eaglebrook Mine also within the Central Wales Orefield and a discovery of in-situ lanarkite has been made at Dolyhir Quarry in the Welsh borderland, but lanarkite remains an extremely rare Welsh species represented by only a handful of specimens.

Key Localities:

There are no key localities for this specimen.


  1. Cotterell, T.F., Green, D.I., Hubbard, N., Mason, J.S., Starkey, R.E. and Tindle, A.G., 2011. The Mineralogy of Dolyhir Quarry, Old Radnor, Powys, Wales. UK Journal of Mines and Minerals, 32, 5-61.
  2. Green, D.I., Rust, S.A. & Mason, J.S., 1996. Classic British mineral localities: Frongoch Mine, Dyfed. UK Journal of Mines & Minerals, 17, 29-38.
  3. Mason, J.S., 1994. A Regional Paragenesis for the Central Wales Orefield. Unpublished M.Phil thesis, University of Wales (Aberystwyth).
  4. Rust, S., Burchmore, S. & Foy, E., 1995. Some interesting new finds from the Nant-y-cagle mine. British Micromount Society Newsletter, 40, 8-10.

There are no references for this specimen.