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Mention the types of optically active cr...

Mention the types of optically active crystals with example.

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Uniaxial crystals: Crystals like calcite, quartz, tourmaline and ice having only one optic axis are called uniaxial crystals.
Biaxial crystals: Crystals like mica, topaz, selentie and aragonite having two optic axes are called biaxial crystals.
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