Glaucochroite

minerals

bustamite

tephroite

manganese

Formula: CaMn2+(SiO4)
Nesosilicate (insular SiO4 groups), olivine group, manganese-bearing mineral
Specific gravity:
Hardness: 6
Streak: White
Colour: Bluish-grey, pink, brown or white
Environments:

Metamorphic environments

Glaucochroite is found in metamorphosed limestone containing manganese minerals.

Alteration

bustamite, tephroite and calcite to glaucochroite and CO2
CaMn2+Si2O6 + Mn2+2(SiO4) + 2CaCO3 ⇌ 3CaMn2+(SiO4) + 2CO2
(DHZ 1A p348)

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