Crystal System: Triclinic
Status of Occurrence: Unconfirmed Occurrence
Distribution: Rare
Chemical Composition: Iron sulphate hydrate
Chemical Formula: Fe2+Fe23+(SO4)4.14H2O
Method(s) of Verification: Parys Mountain - visual only.

Geological Context:

  • Supergene: post-mining oxidation & weathering deposits
Introduction: römerite is a secondary iron sulphate typically developed as an oxidation product of pyritic ore.
Occurrence in Wales: Bor (1950) suggested that a chestnut-brown secondary mineral from Parys Mountain could possibly be römerite, but noted that no identification had been made. Jenkins et al. (2000) list römerite as one of the post-mining minerals from Parys Mountain, but also highlight that no detailed analysis has been made.

Key Localities:

  • Parys Mountain, Anglesey: a few minute chestnut-brown crystals formed by alteration (Bor, 1950).


  1. Bor, L., 1950. Pisanite from Parys Mountain, Anglesey. Mineralogical Magazine, 29, 63-67.
  2. Jenkins, D. A., Johnson, D. B. & Freeman, C., 2000. Mynydd Parys Cu-Pb-Zn mines: mineralogy, microbiology and acid mine drainage. pp. 161-179. In: Environmental Mineralogy: Microbial Interactions, Anthropogenic Influences, Contaminated Land and Waste Management (Cotter-Howells, J. D., Campbell, L. S., Valasami-Jones, E. & Batchelder, M., eds.). The Mineralogical Society of Great Britain & Ireland, London.