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