actinolite
/akˈtɪnəlʌɪt
/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.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).
- minisatellite
- miniscule
- miniseries
- Minisink
- miniskirt
- miniskirted
- minister
- minister general
- ministerial
- ministerialis
- ministerialism
- ministerialist
- ministeriality
- ministerially
- ministering angel
- ministerium
- minister of religion
- Minister of State
- Minister of the Crown
- minister's face
- ministership
- minister's permit
- Minister without Portfolio
- ministrable
- ministrant