Pyroxmangite

inosilicate

rhodonite

Formula: Mn2+SiO3
Inosilicate (chain silicate)
Pyroxmangite forms a complete solid solution with pyroxferrite.
Specific gravity: 3.61 to 3.80
Hardness: 5½ to 6
Streak: White
Colour: Pale pink to rose, often red-brown due to alteration
Solubility: Insoluble in acids. Easily fusible to a black bead.
Environments:

Pegmatites
Metamorphic environments

Pyroxmangite is the high-pressure, low-temperature polymorph of rhodonite. It occurs typically in regionally metamorphosed and contact metasomatic manganese-bearing rocks, associated with spessartine, amphibole, tephroite, alleghanyite, hausmannite, pyrophanite, alabandite, rhodonite and rhodochrosite. It has been recorded from a grunerite-garnet schist where it occurs associated with rhodonite and iron-rich pyroxene.

Common impurities: Al,Fe,Mg,Ca,Na,K,H2O

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