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sodic-calcic amphibole group
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sodic-calcic amphibole group

mineralogy
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The sodic-calcic amphibole group is a subdivision of the larger amphibole mineral group, which are common rock-forming silicate minerals. Amphiboles are characterized by a double chain structure of silicon-oxygen tetrahedrons with the general formula A0–1B2C5T8O22(OH, F, Cl)2. The sodic-calcic amphibole group specifically refers to amphiboles where both sodium and calcium are significant cations within the B-group cation occupancy. These minerals are typically found in metamorphic and igneous rocks. Their chemical complexity allows for a wide range of substitutions, leading to numerous mineral compositions within the group.1

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4 Britannica Sources
  1. amphibole group
  2. amphibole
  3. amphibolite facies
  4. mineral - Inosilicates

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