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.’

  More example sentences

  • ‘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.’
  • ‘Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.’
  • ‘The presence of several amphibole minerals, such as tremolite, actinolite, anthophyllite, was confirmed.’