Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence - 1st UK recording
Distribution: Rare
Chemical Composition: Potassium sodium calcium manganese aluminium silicate hydroxide hydrate
Chemical Formula: (K,Na,Ca)(Mn,Al)7Si8O20(OH)8.2H2O
Method(s) of Verification: Cwm Nantcol - XRD (Natural History Museum, ref. no. x19721).

Chemical Group:

  • Silicates

Geological Context:

  • Metamorphic: low-grade
  • Sedimentary: diagenetic
Introduction: parsettensite is a manganese mineral found in mineral deposits where it is associated with minerals such as piemontite, rhodonite, manganoan calcite, rhodochrosite, and ganophyllite.
Occurrence in Wales: parsettensite is only known from one locality in the British Isles, from Cwm Nantcol, in the Harlech Dome area of Gwynedd.

Key Localities:

There are no key localities for this specimen.


There are no references for this specimen.