…There are α type (trigonal crystal system), β type (hexagonal crystal system), and γ type (cubic crystal system), and α type is stable at high temperatures. Industrially, it is usually produced from alumina ores such as bauxite by the Bayer process invented by Austrian Karl Josef Bayer in 1888. Natural alumina crystals include corundum, and its pure and beautifully colored counterparts such as rubies and sapphires are used as gemstones. … *Some of the terminology referenced in "Bayer, KJ" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…α型(三方晶系),β型(六方晶系),γ型(等軸晶系)があり,高温ではα型が安定である。工業的には,ボーキサイトなどのアルミナ鉱石から,1888年にオーストリアのバイヤーKarl Josef Bayerによって発明されたバイヤー法により製造するのが普通である。天然のアルミナ結晶にはコランダム(鋼玉)があり,その純粋で美しく着色したルビーやサファイアなどは宝石に使われる。… ※「Bayer,K.J.」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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