Discuss the optical properties of pyroxene group minerals.

The pyroxene group minerals are a significant component of the Earth's crust and mantle, exhibiting a diverse range of optical properties that are pivotal for their identification and characterization in the fields of crystallography, mineralogy, and economic geology. These minerals, primarily composed of single-chain silicate tetrahedra, often crystallize in the form of prismatic crystals with two cleavage planes intersecting at approximately 90 degrees. Understanding their optical properties provides crucial insights into their composition, structure, and geological significance.

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