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Prasiolite, ''green-quartz'' or ''vermarine'' is a green form of quartz, a silicate mineral chemically silicon dioxide. Prasiolite is one of several quartz varieties. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, but it is also seen in Lower Silesia in Poland. Naturally occurring prasiolite is also found in the Thunder Bay area of Canada. Prasiolite can also be found spelled praziolite. Prasiolite can be confused with the similarly colored ''praseolite'' which results from the heat treatment of iolite, a variety of cordierite.〔(【引用サイトリンク】 title=Prasiolite )〕 It is a rare stone in nature. Most prasiolite sold is used in jewellery settings. Prasiolite is heat treated amethyst.〔 Most amethyst will turn yellow or orange when heated producing citrine. But some amethyst will turn green when treated. Currently, almost all prasiolite on the market results from a combination of heat treatment and ionizing radiation. Green quartz is sometimes incorrectly called green amethyst, which is an actual misnomer and not an acceptable name for the material, the proper terminology being Prasiolite.〔(【引用サイトリンク】 title=Green Amethyst )〕 It is actually against Federal Trade Commission Guidelines to call prasiolite "green amethyst." Other names for green quartz are vermarine, greened amethyst, or lime citrine. The name is derived from Greek πράσον ''prason'' meaning "leek" and λίθος ''lithos'' meaning "stone." This means that "prasiolite" literally means "scallion green-colored stone." The mineral was given its name due to its green-colored appearance. ==See also== * List of minerals 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Prasiolite」の詳細全文を読む スポンサード リンク
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