Chondrodite

nesosilicate

dolomite

Formula: Mg5(SiO4)2F2 nesosilicate (insular SiO4 groups)
Specific gravity: 3.1 to 3.2
Hardness: 6 - 6½
Streak: White
Colour: Yellow, brown, red, rarely green
Solubility: Slightly soluble in hydrochloric acid
Environments:

Carbonatites (rarely)
Metamorphic environments (typically)

Chondrodite occurs in contact or regionally metamorphosed dolomitic limestone or dolostone, associated with diopside, spinel and phlogopite.
It also may be found in serpentinite associated with magnetite, and in skarn associated with wollastonite, forsterite and monticellite.
At Palabora, Limpopo Province, South Africa, chondrodite occurs atypically in carbonatite, associated with calcite, magnetite, clinochlore and less commonly with iowaite Mg6Fe3+2(OH)16Cl2.4H2O (R&M.92.5.437).

Common impurities: Ti,Al,Mn

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