rhodonite

A pink to rose-red mineral, essentially a glassy crystalline manganese silicate, MnSiO₃, used as an ornamental stone.

Native manganese silicate, sometimes containing zinc or calcium: a mineral occurring massive, rarely in distinct crystals, of a fine rose-red or pink color. It is sometimes used as an ornamental stone.

Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.

a manganese inosilicate mineral with some substitution by iron and magnesium, of composition (Mn2+,Fe,Mg,Ca)SiO3

a pink or red mineral consisting of crystalline manganese silicate; used as an ornamental stone