Xonotlite

inosilicate

rhodonite

Formula: Fe2+Al2O4
Inosilicate (chain silicate)
Specific gravity: 2.7
Hardness: 6½
Streak: white
Colour: colourless, white, grey, pale pink
Environments:

Metamorphic environments

Xonotlite occurs in veinlets in serpentine or in contact metamorphic deposits within limestone.

Alteration

johannsenite and H2O to rhodonite and xonotlite
6CaMnSi2O6 + H2O → 6Mn2+SiO3 + Ca6Si6O17(OH)2
At Pueblo, Mexico, johannsenite occurs in calcite veins in rhyolite and is altered to rhodonite and xonotlite according to the above equation (DHZ 2A p421).

Common impurities: Fe, Mn, H2O

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