Pyroxmangite has the general chemical formula of MnSiO3.Pinckney, Linda R, and Charles W Burnham. "High-Temperature crystal structure of pyroxmangite." American Mineralogist 73 (1988): 809–817. GeoScienceWorld. Web. 13 September 2010. It is the high-pressure, low-temperature dimorph of rhodonite.
It was first described in 1913 and named for the mineral group, pyroxenes, and is known as the manganese member. It forms a series with pyroxferroite.
Pyroxmangite occurs in metamorphosed ore deposits rich in manganese. Associated minerals include spessartine, tephroite, alleghanyite, hausmannite, pyrophanite, alabandite, rhodonite and rhodochrosite.
References