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Crystal System: Triclinic
Status of Occurrence: Confirmed Occurrence - 2nd UK recording
Distribution: Rare
Chemical Composition: Manganese silicate
Chemical Formula: MnSiO3
Method(s) of Verification: Nant Mine - XRD (National Museum of Wales, NMW X-1501) & EMPA (Open University).

Chemical Group:

Geological Context:

Pyroxmangite 30 mm across from Nant Mine, Ll?n. National Museum of Wales Collection (no. NMW 58.444.GR.5d). Photo T.F. Cotterell, © National Museum of Wales.
Introduction: a rare pyroxene group mineral typically found in regionally metamorphosed manganese ore deposits and manganiferous rocks.
Occurrence in Wales: pyroxmangite was identified recently (Cotterell, 2006) on a specimen in the National Museum of Wales Mineral Collection during detailed research into the complex mineralogy of manganese ores from the Benallt and Nant mines near Rhiw.

Key Localities:


  1. Cotterell, T.F., 2006. Caryopilite and pyroxmangite from Nant Mine, Nant-y-Gadwen, Llanfaelrhys, Pen Llyn, Gwynedd, Wales UK Journal of Mines and Minerals, 27, 51-53.