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actinolite

Pronunciation: /akˈtɪnəlʌɪt/
Definition of actinolite

noun

[mass noun]
  • a green mineral of the amphibole group containing calcium, magnesium, and iron and occurring chiefly in metamorphic rocks and as a form of asbestos.

Origin:

late 18th century: from Greek aktis, aktin- 'ray' + lithos 'stone' (because of the ray-like crystals)

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