Prasiolite

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Prasiolite, green-quartz or vermarine is a green form of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, but it is seen in Lower Silesia in Poland. The gem has a refractive index of 1.54-1.553. ^[1] It is usually produced artificially by heat-treating amethyst.

The terms green amethyst and greened amethyst are considered misnomers by gemologists.

[edit] References

1. ^ Listing for refractive index

• http://www.gemhut.com/prasio.htm
• http://www.mindat.org/min-6703.html