Glaucochroite

Formula: CaMn²⁺(SiO₄)
Nesosilicate (insular SiO₄ groups), olivine group, manganese-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.407 measured, 3.465 calculated
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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