actinolite(redirected from Zillerthite)
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actinolite(ăktĭn`əlīt): see amphiboleamphibole
, any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements.
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Ca2(Mg,Fe)5Si8O22(OH)2 A green, monoclinic rock-forming amphibole; a variety of asbestos occurring in needlelike crystals and in fibrous or columnar forms; specific gravity 3-3.2.