Prasiolite

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Prasiolite or vermarine is a green-colored form of quartz, usually produced by artificially heat-treating amethyst. Since 1950, almost all has come from one small mine in Brazil. Natural prasiolite has also been obeserved in Lower Silesia in Poland.[1] The gem has a refractive index of about 1.54-1.553.[2]

This material is occasionally referred to as "green amethyst" which is considered a misnomer by gemologists.

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