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calcic amphibole group
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calcic amphibole group

mineralogy
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The calcic amphibole group is a classification within the broader amphibole group of silicate minerals. Amphiboles are common in igneous and metamorphic rocks and are characterized by a double chain silicate structure. Their general chemical formula is A0–1B2C5T8O22(OH, F, Cl)2. The calcic amphibole group specifically refers to amphiboles where calcium is a significant cation in the B site. Common examples include tremolite and actinolite, which form a series with increasing iron content. These minerals typically form prismatic crystals and have two directions of cleavage intersecting at about 56° and 124°.1

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  1. amphibole
  2. amphibole group
  3. amphibolite facies

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