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A greenish amphibole mineral, Ca2(Mg,Fe)5Si8O22(OH)2, that occurs in several forms, including a fibrous form that is a variety of asbestos.
(Minerals) a green mineral of the amphibole group consisting of calcium magnesium iron silicate. Formula: Ca2(Mg,Fe)5Si8O22(OH)2
[C19: from actino- (from the radiating crystals in some forms) + -lite]
a variety of amphibole, occurring in greenish bladed crystals or in masses.
ac•tin`o•lit′ic (-ˈɪt ɪk) adj.
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|Noun||1.||actinolite - a green mineral of the amphibole group; calcium magnesium iron silicate|
amphibole - a mineral or mineral variety belonging to the amphibole group
amphibole group - a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum