Datolite

nesosilicate

zeolite

Formula: CaB(SiO4)(OH) nesosilicate (insular SiO4 groups)
Specific gravity: 2.9 to 3.0
Hardness: 5 to 5½
Streak: White
Colour: Colourless, white, yellow, greenish, seldom grey, reddish
Solubility: Slightly soluble in hydrochloric acid

Environments:

Metamorphic environments
Hydrothermal environments
Basaltic cavities

Datolite is a secondary mineral usually found in cavities in basalt lavas and similar rocks, associated with zeolites, prehnite, apophyllite and calcite. It also occurs in limestone skarn, serpentinite, schist, and ore veins.

Common impurities: Mn,Mg,Al,Fe

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