Crystal System: Orthorhombic
Status of Occurrence: Unconfirmed Occurrence
Chemical Composition: Lead copper zinc vanadate hydroxide
Chemical Formula: PbCu(VO4)(OH)
Method(s) of Verification: Flintshire - XRD (Natural History Museum, London, 3008F).
- Supergene: in situ natural oxidation & weathering deposits
Introduction: mottramite develops typically as a secondary mineral within the near-surface oxidized zone of lead-copper-vanadium ore deposits.
Occurrence in Wales: a dubious Welsh mineral. Both locality and verification details are vague.
- Flintshire: an X-ray investigation by the Natural History Museum, London of a sample from 'Flintshire' was identified as 'mottramite or very near' (Bevins, 1994).
- Bevins, R.E., 1994. A Mineralogy of Wales National Museum of Wales, Geological Series No. 16, Cardiff, 146pp.