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Formula: Mn2+SiO3
Inosilicate (chain silicate)
Pyroxmangite forms a complete solid solution with pyroxferroite
Crystal System: Triclinic
Specific gravity: 3.61 to 3.80 measured, 3.75 calculated
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.
Common impurities: Al,Fe,Mg,Ca,Na,K,H2O
Environments:
Pegmatites
Metamorphic environments
Pyroxmangite is the high-pressure, low-temperature paramorph of
rhodonite.
It occurs typically in regionally metamorphosed and
contact metasomatic manganese-bearing rocks,
(Dana, Webmin)
associated with spessartine, amphibole,
tephroite, alleghanyite,
hausmannite, pyrophanite,
alabandite, rhodonite and
rhodochrosite
(HOM, DHZ 2A p611). It has been recorded from a
grunerite-garnet
schist where
it occurs associated with rhodonite and iron-rich
pyroxene
(DHZ 2A p611).
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