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actinolite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) 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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