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
A bright green variety of amphibole occurring usually in fibrous or columnar masses
A mineral with monoclinic crystals of the chemical formula Ca{2}(Mg,Fe){5}Si{8}O{22}(OH){2}, belonging to the amphibole group
Colourless to green amphibole mineral, darkening with increased iron content from green to black. It has a prismatic and splintery texture and is abundant in regionally metamorphosed (see metamorphism) rocks such as schists. Actinolite has a monoclinic crystal structure, and it may alter to chlorite. See also asbestos