Formula: CaB(SiO4)(OH) nesosilicate (insular SiO4 groups)
Specific gravity: 2.9 to 3.0
Hardness: 5 to 5½
Colour: Colourless, white, yellow, greenish, seldom grey, reddish
Solubility: Slightly soluble in hydrochloric acid
Datolite is a secondary mineral usually found in cavities in basalt lavas and similar rocks, associated with
apophyllite and calcite.
It also occurs in limestone skarn,
serpentinite, schist, and ore veins.
Common impurities: Mn,Mg,Al,Fe
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