Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to actinolite: epidote, tremolite


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]


(ækˈtɪn lˌaɪt)

a variety of amphibole, occurring in greenish bladed crystals or in masses.
ac•tin`o•lit′ic (-ˈɪt ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.actinolite - a green mineral of the amphibole groupactinolite - 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
References in periodicals archive ?
Samples include magnetite-quartz-chalcopyrite veins and semi-massive sulfide pods associated with chlorite, epidote, actinolite and K-feldspar alteration.
According to Title 34 Labor and Workmens Compensation, Chapter 5A-34 (C.34:5A-34 Definitions)), asbestos is defined as asbestiform varieties of actinolite, amosite (cummuningtonitegrunerite), anthophyllite, chrysotile (serpentine), crocidolite (riebeckite) and tremolite.
This hot fluid changes the rock so that minerals without hydroxyl groups (OH-) or water in their structures (pyroxene, plagioclase feldspar and olivine) are often altered to minerals with hydroxyl groups (OH-) in their structures, such as chlorite, epidote, actinolite and serpentine.
The samples of green schist are inequigranular and fine to coarse-grained and consist of amphibole including actinolite, plagioclase, quartz, epidote, carbonate, ilmenite, rutile, ore mineral(s) and a substantial amount of clay.
Asbestos (Chrysolite, Amosite, Crocidolite, Tremolite, Actinolite, and Anthophyllite).
There is a dire need to acquaint our workforce with the composition of asbestos material in the form of fibrous silicate minerals actinolite, amosite, anthophyllite, crocidolite, tremolite and chysolite.
Quartz is found as part of a propylitic alteration assemblage including chlorite and actinolite that overprints higher temperature, pyroxene-bearing assemblages [64-66].
Asbestos (chrysotile, amosite, crocidolite, tremolite, actinolite and anthophyllite).
The conditions of metamorphism of the metabasites of the Arquia Complex in all lithotypes studied along the Central Cordillera reached the amphibolite facies for the garnet-amphibolite without garnet and greenschist facies for the epidote actinolite schists.
Metamorphic rocks are the predominant lithology, represented by locally calcareous chlorite, sericite and graphite phyllites, and micaceous, actinolite and talc schists and minor graphite schists of Paleogene age, which reached the greenschist facies.
Compared to amphiboles in the tremolite-actinolite-ferroactinolite series (Deer et al., 1997), the overall pale colour, relatively low SG and weak pleochroism corresponded to a member with a low iron content, and therefore suggested tremolite, rather than actinolite, as the identity of this crystal.