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Ullmannite from selected localities.

UK
 
  • Wales
    • Ceredigion
      • Ceulanymaesmawr
        • Bontgoch (Elerch)
BMS Database
      • Upper Llanfihangell-y-Creuddyn
        • Pontrhydygroes
Mason, J.S. (1994) A Regional Paragenesis for the Central Wales Orefield. Unpublished external M.Phil. degree thesis, University of Wales, Aberystwyth.; Green, D.I., Rust, S.A., Mason, J.S. (1996) Classic British mineral localities: Frongoch mine, Dyfed. UK Journal of Mines & Minerals, 17, 29-39.; Rust, Steve A. (2019) Minerals of the Frongoch Mine. Published by the author, 180 pages. ISBN 978-1-9162641-0-6.
BMS Database
National Museum of Wales database; National Museum of Wales database
 
and/or  
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