Actinolite - Amphibole group
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Group of minerals that contain iron, magnesium, silicon, oxygen, and hydroxyl (OH). Amphiboles may also contain calcium, sodium, and lithium. The amphiboles have prismatic cleavage with an angle of 56° and 124°, which distinguishes it from the pyroxenes, which have an angle of 87° and 93° (almost perpendicular). The amphiboles are very similar to the pyroxenes, and the minerals belonging to each Group often cannot be distinguished by ordinary methods.