Usually finegrained quartzite-like rhodonite enriched by manganese and low contents of iron and magnesium (usually <1-2 wt.% FeO+MgO). Usually metasomatic origin (manganese skarns).
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.