Mineralogy and Crystallography

A Dictionary of Earth Sciences The Columbia Encyclopedia, 6th ed. Further reading

actinolite

A Dictionary of Earth Sciences | 1999 | | Copyright

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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actinolite

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

actinolite : see amphibole .

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"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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