Describe the physical properties of minerals belonging to pyroxene group giving suitable examples.

Minerals of the pyroxene group are an important class of inosilicate minerals characterized by single chains of silica tetrahedra. They play a significant role in the fields of crystallography, mineralogy, and economic geology due to their abundance in igneous and metamorphic rocks and their implications for understanding geological processes and mineral resources.

Physically, pyroxenes typically exhibit a monoclinic crystal system, although some members show orthorhombic symmetry. Their crystals often form prismatic or stubby prismatic habits, sometimes appearing blocky or granular. The typical cleavage of pyroxenes is good to perfect in two directions intersecting at approximately 90°, which helps distinguish them from amphiboles, another chain silicate group with cleavage angles of about 60° and 120°. This near-right-angle cleavage is an important diagnostic feature in mineral ______ ________ _________ _____ ____ _______ ______.
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