Number of minerals that have iron, magnesium, silicon, oxygen, and hydroxyl (OH). Amphiboles could also include calcium, sodium, and lithium. The amphiboles have actually prismatic cleavage with an angle of 56° and 124°, which distinguishes it through the pyroxenes, which have an angle of 87° and 93° (almost perpendicular). The amphiboles are quite similar to your pyroxenes, and the minerals owned by each combined team frequently cannot be distinguished by ordinary techniques. Generally, however, the amphiboles happen in longer, thinner crystals than the pyroxenes. The pyroxenes support the exact same elements that the amphiboles do, except they lack hydroxyl, which alters both physical and properties being chemical.