Crystal System: Monoclinic
Status of Occurrence: Confirmed Occurrence - 1st UK recording
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).
- 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.
There are no key localities for this specimen.
There are no references for this specimen.