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

The pyroxene group of minerals is an important class of inosilicate minerals that are commonly found in igneous and metamorphic rocks. These minerals are characterized by their distinctive crystal structure, which consists of single chains of silica tetrahedra linked together by metal cations. Pyroxenes exhibit a range of physical properties that make them significant in crystallography, mineralogy, and economic geology.

Crystal System and Habit

Pyroxenes crystallize in two major crystal systems: monoclinic (clinopyroxenes) and orthorhombic (orthopyroxenes). They typically form short, stubby prismatic crystals with a nearly square or eight-sided cross-section. Common habits include granular, massive, and lamellar forms.

Cleavage and Fracture

A key distinguishing feature of pyroxenes is their two prominent cleavage planes, which intersect at approximately 90° (87° and 93°). This cleavage pattern helps in distinguishing them ________ _____ _______ ________ ____.
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