Specific gravity: 2.24 to 2.31
Hardness: 5 to 5½
Colour: Colourless, white, pink, salmon, red, green
Solubility: Soluble in common acids
Common impurities: Na,K
Scolecite occurs in basalt,
andesite, gneiss, and
contact metamorphic and in
hydrothermal environments. It is associated with other
quartz and prehnite
In Eritrea scolecite has been reported in weathered basalt, associated with stilbite and calcite (DHZ 4 p375).
Near a pegmatite at Valle Maggia, Switzerland, scolecite occurs in crevices in biotite gneiss associated with K-feldspar variety adularia, epidote and chlorite (DHZ 4 p375).
On the Isle of Mull, Scotland, UK, scolecite occurs in profusion in basaltic cavities, and is often the final product of the sequence
albite → chlorite → epidote → prehnite → scolecite
though in some cavities heulandite succeeds scolecite (DHZ 4 p375).
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