actinolite


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Related to actinolite: epidote, tremolite

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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actinolite

[‚ak′tin·ə‚līt]
(mineralogy)
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.
References in periodicals archive ?
These rocks are composed mainly of chlorite and actinolite to amphibole schists, the last of them with or without garnet, with minor amphibolites and garnet-bearing amphibolites and subordinate amounts of eclogites, serpentinized peridotites and metabasalts.
Health Canada categorizes the different types of asbestos under two broad mineralogical groups: serpentine (chrysotile) and amphibole (tremolite, actinolite, amosite, anthophyllite, crocidolite, etc).
Taking local classes in oil painting, he won a scholarship to attend the Schneider School of Fine Arts in Actinolite for a summer, taking art lessons from many talented artists and giving lessons himself to other students of the school.
2) The different types include chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite.
Crocidolite is a hydrated silicate of sodium and iron, amosite is a monoclinic silicate of iron and magnesium, anthophyllite is a magnesium iron silicate of low aluminium content, tremolite is a hydrated calcium magnesium silicate, and actinolite is a monoclinic calcium magnesium iron member of the amphibole group.
The upper oxidized zone about 30-m deep consisting of hematite, limonite, and martite with copper oxides, and gypsum, halite, and actinolite veins.
Those businesses have been fighting to remove certain forms of three asbestos-like minerals -- tremolite, anthophyllite and actinolite, collectively known as AT&A -- from the tough asbestos standard established by the Occupational Safety and Health Administration (OSHA) in 1972.
Dark green amphbolite gneiss, comprised of equal parts plagioclase and actinolite, is commonly intercalated with the quartz-feldspar gneiss.
The secondary alteration minerals, muscovite + chlorite + actinolite, are identical in the headstone and quarry populations, and only the degree of alteration varies somewhat from one sample to another.
The basement shows brittle deformation and low-grade metamorphic overprint that resulted in development of epidote chlorite albitic plagioclase and actinolite before the emplacement of the granitoids.
All these rocks show a moderate hydrothermal alteration that produced chlorite, smectites (mordenite), talc, titanite, actinolite, albite, quartz, and carbonates (Fig.
These rocks in petrology studies have nemato-plastic texture and have been transformed into Tremolite, Actinolite and Albite schist.