iron-magnesium-manganese amphibole group
mineralogy
Quick Summary
The iron-magnesium-manganese amphibole group is a classification within the broader amphibole mineral group. Amphiboles are common rock-forming silicate minerals characterized by a double chain structure. This specific group is defined by the types of metal ions present in its crystal structure, particularly iron (Fe), magnesium (Mg), and manganese (Mn) in certain positions within the general amphibole formula: A0–1B2C5T8O22(OH, F, Cl)2. These minerals are typically found in metamorphic and igneous rocks.12
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