出典:Wiktionary
出典:『Wiktionary』 (2025/06/12 15:22 UTC 版)
From 中期英語 realgar, from Medieval Latin realgar, resalgar, from Arabic رَهْج اَلْغَار (rahj al-ḡār, literally “cave dust”).
realgar (usually uncountable, plural realgars)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/21 06:32 UTC 版)
Realgar, α-As4S4, is an arsenic sulfide mineral, also known as "ruby sulphur" or "ruby of arsenic". It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related mineral, orpiment (As2S3). It is orange-red in colour, melts at 320 °C, and burns with a bluish flame releasing fumes of arsenic and sulfur. Realgar is soft with a Mohs hardness of 1.5 to 2 and has a specific gravity of 3.5. Its streak is orange colored. It is trimorphous with alacranite and pararealgar.