Imperial Topaz
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…Topaz is broadly divided into two types: the hydroxyl (OH) type with the component Al 2 SiO 4 (OH) 2 , and the fluorine (F) type with the component Al 2 SiO 4 (F) 2. The most valuable gemstone is the hydroxyl type, imperial topaz, which has a beautiful and permanent color and a warm yellow color with a slight reddish tint. This golden-colored stone can turn pink by heat treatment. … *Some of the terminology explanations that mention "Imperial Topaz" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…トパーズはAl2SiO4(OH)2の成分をもつ水酸基(OH)タイプと，Al2SiO4(F)2のフッ素(F)タイプの二つに大別される。宝石として価値の高いのは，色が美しくまた永久性のある水酸基タイプのインペリアル･トパーズで，やや赤みを帯びた暖かい黄色をしている。そしてこの黄金色の石は熱処理によりピンク色に変わる。… ※「インペリアル・トパーズ」について言及している用語解説の一部を掲載しています。 出典｜株式会社平凡社世界大百科事典 第２版について | 情報 |
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