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Realgar

Realgar (/riˈælɡɑːr, -ɡər/ ree-AL-gar, -⁠gər), also known as arsenic blende, ruby sulphur or ruby of arsenic, is an arsenic sulfide mineral with the chemical formula α-As4S4. It is a soft 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…

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2V angle
40°
Birefringence
δ = 0.166
Category
Sulfide mineral
Cleavage
Good on {010}; less so on {101}, {100}, {120}, and {110}
Color
Red to yellow-orange; in polished section, pale gray, with abundant yellow to red internal reflections
Crystal class
Prismatic (2/m) (same H-M symbol)

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Realgar

Nodes27
Edges26
Triples77
Avg. degree1.93
Density0.074074
Components1

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Realgar

Top relations

related to Further reading · 18
Realgar → Bradley, China, Chinese, Clarendon Press, Craigie, Historical Principles, III, In Sir James, IV, Mesny's Chinese Miscellany, Murray, New English Dictionary, Notes, Oxford, Shanghai, Text Book, Vol, William Mesny
related to Gallery · 11
Realgar → Adam Peak, As4S4, Getchell Mine, Humboldt County, La Libertad, Nevada, Peru, Potosi District, Quiruvilca Mine, The, United StatesCherry-red
related to Occurrence · 11
Realgar → Bohemia, Hungary, In, It, Manhattan, Mercur, Nevada, Saxony, US, Utah, Yellowstone National Park
see also · 4
Realgar → Chinese, Classification, Earth, Xionghuang
related to Uses · 3
Realgar → China, Peru, Philippines
related to External links · 2
Realgar → Mindat, Pararealgar
related to Historical uses · 2
Realgar → CH3, OH
2V angle · 1
Realgar → 40°
Birefringence · 1
Realgar → δ = 0.166
Category · 1
Realgar → Sulfide mineral

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Important terminology

orpiment arsenic pararealgar used also mineral chinese known crystals arsenolite yellow powder sulfide china occurs monoclinic carcinogenic mine red formula

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Realgar2V angle40°1.00infobox
RealgarBirefringenceδ = 0.1661.00infobox
RealgarCategorySulfide mineral1.00infobox
RealgarCleavageGood on {010}; less so on {101}, {100}, {120}, and {110}1.00infobox
RealgarColorRed to yellow-orange; in polished section, pale gray, with abundant yellow to red internal reflections1.00infobox
RealgarCrystal classPrismatic (2/m) (same H-M symbol)1.00infobox
RealgarCrystal habitPrismatic striated crystals; more commonly massive, coarse to fine granular, or as incrustations1.00infobox
RealgarCrystal systemMonoclinic1.00infobox
RealgarDiaphaneityTransparent1.00infobox
RealgarDispersionr > v, very strong1.00infobox
RealgarFormula.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l…1.00infobox
RealgarIMA symbolRlg1.00infobox
RealgarLusterResinous to greasy1.00infobox
RealgarMohs scale hardness1.5–21.00infobox
RealgarOptical propertiesBiaxial (−)1.00infobox
RealgarOther characteristicsToxic and carcinogenic. Disintegrates on long exposure to light to a powder composed of pararealgar or arsenolite and orpiment.1.00infobox
RealgarPleochroismNearly colorless to pale golden yellow1.00infobox
RealgarRefractive indexnα = 2.538 nβ = 2.684 nγ = 2.7041.00infobox
RealgarSpace groupP21/n (no. 14)1.00infobox
RealgarSpecific gravity3.561.00infobox
RealgarStreakRed-orange to red1.00infobox
RealgarStrunz classification2.FA.15a1.00infobox
RealgarTenacitySectile, slightly brittle1.00infobox
RealgarTwinningContact twins on {100}1.00infobox
RealgarUnit cella = 9.325(3) Å b = 13.571(5) Å c = 6.587(3) Å β = 106.43°; Z = 161.00infobox

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