Realgar: Difference between revisions
Jump to navigation
Jump to search
imported>Paul Wormer (New page: {{subpages}} '''Realgar''' is a mineral consisting of arsenic monosulfide (α-As<sub>4</sub>S<sub>4</sub>). Its composition in weight is: 70.03% arsenic and 29.97 % sulfur and...) |
John Leach (talk | contribs) |
||
| Line 1: | Line 1: | ||
{{subpages}} | {{subpages}} | ||
'''Realgar''' is a mineral consisting of arsenic monosulfide (α-As<sub>4</sub>S<sub>4</sub>). Its composition in weight is: 70.03% [[arsenic]] and 29.97 % [[ | '''Realgar''' is a mineral consisting of arsenic monosulfide (α-As<sub>4</sub>S<sub>4</sub>). Its composition in weight is: 70.03% [[arsenic]] and 29.97 % [[sulphur]] and its [[molecular mass|molecular weight]] is 106.9. | ||
Realgar has a red to yellow color and is often found among other arsenic minerals, less often with [[silver]] and [[lead]] ores. Its crystal structure is [[monoclinic]], showing short prismatic crytals. Under a prolonged exposure to light it disintegrates to a powder which long was thought to be [[orpiment]], but in fact is the polymorph [[pararealgar]].<ref>P. Bonazzi, S. Menchetti, G. Pratesi, ''The crystal structure of pararealgar'', American Mineralogist , vol. '''80''', pp. 400-403 (1995) [http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1995/Bonazzi_p400-403_95.pdf pdf]</ref> . Realgar when heated forms [[yellow arsenic]], a poisonous oxide used in metallurgy. | Realgar has a red to yellow color and is often found among other arsenic minerals, less often with [[silver]] and [[lead]] ores. Its crystal structure is [[monoclinic]], showing short prismatic crytals. Under a prolonged exposure to light it disintegrates to a powder which long was thought to be [[orpiment]], but in fact is the polymorph [[pararealgar]].<ref>P. Bonazzi, S. Menchetti, G. Pratesi, ''The crystal structure of pararealgar'', American Mineralogist , vol. '''80''', pp. 400-403 (1995) [http://www.minsocam.org/MSA/AmMin/TOC/Articles_Free/1995/Bonazzi_p400-403_95.pdf pdf]</ref> . Realgar when heated forms [[yellow arsenic]], a poisonous oxide used in metallurgy. | ||
Latest revision as of 09:16, 6 March 2024
Realgar is a mineral consisting of arsenic monosulfide (α-As4S4). Its composition in weight is: 70.03% arsenic and 29.97 % sulphur and its molecular weight is 106.9.
Realgar has a red to yellow color and is often found among other arsenic minerals, less often with silver and lead ores. Its crystal structure is monoclinic, showing short prismatic crytals. Under a prolonged exposure to light it disintegrates to a powder which long was thought to be orpiment, but in fact is the polymorph pararealgar.[1] . Realgar when heated forms yellow arsenic, a poisonous oxide used in metallurgy.
The name is from the Arabic, ''rahj al-ġār [powder of the mine].