...A mineral with the chemical composition As 2 S 3. The Japanese name "Yuou" is originally another name for realgar, and it is considered preferable to use the names "Shiou" or "Sekiou" for orpiment. It is lemon yellow and transparent, with a greasy luster, and the cleavage planes have a pearly luster. It belongs to the monoclinic crystal system, and its idiomorph is a short columnar shape close to the orthorhombic crystal system. It usually forms leaf-shaped aggregates or clumps. It is perfectly cleaved {010}. Mohs hardness is 1.5-2, specific gravity is 3.48. It melts easily when heated with a candle, and emits a strong garlic odor. ... *Some of the terminology that refers to "orpimento" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…化学成分As2S3の鉱物。雄黄という和名は,本来鶏冠石の別称であり,orpimentに対しては,雌黄(しおう)または石黄(せきおう)の名称を使用するのが望ましいとされている。レモン黄色透明で,脂肪光沢,へき開面は真珠光沢をもつ。単斜晶系に属し,自形は斜方晶系に近い短柱状である。通常葉片状集合体ないし塊状をなす。へき開は{010}に完全。モース硬度1.5~2,比重3.48。ろうそくで加熱すると容易に溶け,強いニンニク臭を発する。… ※「オーピメント」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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