It is a silicate mineral with a complex composition, which is why it has the widest variety of colors among gemstones. Parti-colored tourmaline, which has two or more colored areas in a single crystal, and watermelon, which is green on the outside and red or pink on the inside, are characteristics unique to tourmaline and are highly valued. There are also single-colored varieties ranging from colorless to red, yellow, green, blue, purple, brown, and black. The most common is green tourmaline, but each has its own name, such as red or pink rubellite, dark blue indicolite, colorless achroite, and black schorl. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
複雑な組成のケイ酸塩鉱物で,そのために宝石のうちでも多様な色彩をもつ。一つの結晶石で二つあるいはそれ以上の色の部分をもつパーティカラード・トルマリンparti‐colored t.や,外側が緑色,内側が赤ないしピンク色の,スイカを思わせる〈ウォーター・メロン〉はトルマリンのみに見られる特徴で,珍重される。また単色でも,無色から赤,黄,緑,青,紫,褐色,黒までの色をもつものが見られる。代表的なものは緑色のグリーン・トルマリンであるが,赤ないしピンクのルーベライトrubellite,濃青色のインディコライトindicolite,無色のアクロアイトachroite,黒色のショールschorlなど,それぞれ別名をもっている。
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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