Actinolite

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A green to black Fe-bearing amphibole with the chemical formula Ca (Mg,Fe) Si O (OH) occupying the midrange of the tremolite-ferroactinolite compositional series. Actinolite can occur in a variety of crystal shapes and sometimes occurs as asbestiform fibers.

A bright to gray-green member of the amphibole mineral family. In addition to silica, it contains calcium, magnesium, and iron. Actinolite is a non-hazardous relative of asbestos and is a common mineral in metamorphic rocks.

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