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actinolite
actinolite A member of the amphiboles, *Ca2(Mg,Fe)5[Si4O11]12(OH,F)2 with the ratio Fe/Fe + Mg = 0.9 to 0.5, belonging to the tremolite-*ferroactinolite series of Carich amphiboles; sp. gr. 3.0–3.4; hardness 5–6; monoclinic; light greenish-grey to dark green; white streak; vitreous lustre; habit acicular, often fibrous and felted; cleavage prismatic, good {110}; occurs widely in low- to medium-grade schists and some igneous rocks. The asbestiform variety is called nephrite and such felted forms were used in the past for insulation and fire-resistant materials, but the development of asbestosis in workers has severely restricted their use.
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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "actinolite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "actinolite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-actinolite.html AILSA ALLABY and MICHAEL ALLABY. "actinolite." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-actinolite.html |
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actinolite
actinolite : see amphibole . |
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Cite this article
"actinolite." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "actinolite." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1E1-X-actinoli.html "actinolite." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-actinoli.html |
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