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In thin sections, amphiboles are distinguished by several properties, including two directions of cleavage at approximately 56 and 124, six-sided basal cross sections, characteristic colour, and pleochroism (colour variance with the direction of light propagation).
Identification: Typically, amphiboles form as long prismatic crystals, radiating sprays and fibrous aggregates. They are generally dark coloured though their colours can range from colourless to white, green, brown, black, blue or lavender. This property is related to composition, particularly iron content.
Amphiboles are a complex family of hydrous silicate minerals. They take the general formula X7Si8O22(OH)2where X can be a combination of calcium (Ca), Iron (Fe), magnesium (Mg) or sodium (Na).
The mineral nomenclature of the amphiboles is divided into four principal subdivisions based on B-group cation occupancy: (1) the iron-magnesium-manganese amphibole group, (2) the calcic amphibole group, (3) the sodic-calcic amphibole group, and (4) the sodic amphibole group.
Amphiboles have hydroxyl groups in their structure and are considered to be hydrous silicates that are stable only in hydrous environments where water can be incorporated into the structure as (OH)-.
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Amphibole is a classification and group of silicate minerals mostly found in metamorphic rocks and in some igneous rocks. There are four compositional groups or species of amphiboles: iron-magnesium, calcic, sodic-calcic, and sodic.
Amphiboles are minerals of either igneous or metamorphic origin. Amphiboles are more common in intermediate to felsic igneous rocks than in mafic igneous rocks, because the higher silica and dissolved water content of the more evolved magmas favors formation of amphiboles rather than pyroxenes.

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