Formula: Ca4Si6O17(H2O)2.(Ca.3H2O) phyllosilicate
Specific gravity: 2.40 to 2.48
Colour: White, pinkish white
Tobermorite is a hydrothermal alteration product of calcium carbonate rocks, due to contact metamorphism,
and it is found filling vesicles and cavities in basalt.
Associated minerals include gyrolite,
ettringite and calcite.
At Crestmore, California, USA, tobermorite is associated with blue calcite, monticellite and vesuvianite.
Common impurities: Al,Fe,Mg,Na,K,H2O
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