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actinolite Line breaks: ac¦tino|lite
Pronunciation: /akˈtɪnəlʌɪt/

Entry from British & World English dictionary

Definition of actinolite in English:

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.
Example sentences
  • They have a mineralogical association of quartz, diopside, actinolite, plagioclase and K-feldspar.
  • Amosite, fibrous anthophyllite, fibrous tremolite, fibrous actinolite, and crocidolite are amphiboles, double-chain silicates, which observed microscopically look like sharp needles.
  • Kyanite, microcline, zircon, monazite and opaque minerals are variably present with epidote, actinolite and chlorite being present as secondary alteration minerals.

Origin

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

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