REALGAR

Realgar

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 . 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.

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realgar

Noun

  1. A mineral, arsenic sulfide (AsS), often associated with orpiment and stibnite in lead, silver and gold ores.


The above text is a snippet from Wiktionary: realgar
and as such is available under the Creative Commons Attribution/Share-Alike License.

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