Spurrite

nesosilicate

monticellite

Formula: Ca5(SiO4)2(CO3) nesosilicate (insular SiO4 groups)
Specific gravity: 3
Hardness: 5
Streak: white
Colour: colourless, grey-white, lilac-grey
Environments:

Metamorphic environments

Spurrite is a common component of magnesian skarn at the contact zone between limestone and diorite.

Alteration

monticellite and spurrite to merwinite and calcite
2CaMg(SiO4) + Ca5(SiO4)2(CO3) ⇌ 2Ca3Mg(SiO4)2 + CaCO3

monticellite, spurrite and quartz to merwinite and CO2
5CaMg(SiO4) + Ca5(SiO4)2(CO3) + SiO2 ⇌ 5Ca3Mg(SiO4)2 + 2CO2

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