1) Manganese mineral 
Kanoite is a light pinkish brown silicate mineral that is found in metamorphic rocks. It is an inosilicate and has a formula of (Mg,Mn2+)2Si2O6. It is a member of pyroxene group and clinopyroxene subgroup. ==Crystallography== Kanoite crystallizes in the monoclinic crystal system. Its Hermann–Mauguin Symbol is 2/m. Under this crystal system, the ...