Formation Process For Large Calcite Crystal

Citrine is the yellow to brownishred variety of the mineral quartz is a widely used as a gemstone, and after amethyst it is the most popular quartz gemost citrine is formed by heat treating purple amethysttrine may also be produced by heattreating smoky quartz from certain localitiesn some amethyst deposits, the amethyst has been partially or fully changed over to yellow citrine.

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