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Encyclopedia > Realgar
Orpiment and Realgar
Orpiment and Realgar

Realgar is an arsenic sulfide mineral with formula: As4S4. 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. Orpiment and Realgar Source: US Government File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Orpiment and Realgar Source: US Government File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... General Name, Symbol, Number arsenic, As, 33 Chemical series metalloids Group, Period, Block 15, 4, p Appearance metallic gray Atomic mass 74. ... The term sulfide (sulphide in British) refers to several types of chemical compounds containing sulfur in its lowest oxidation number of -2. ... In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Orpiment Orpiment prepared as a paint pigment Orpiment is a common monoclinic crystalline mineral Chemical Composition: As2S3, arsenic trisulfide Molecular Weight: 246. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ...


Its name comes from Arabic rahj al-ghār – 'powder of the mine,' via Catalonian, Middle Latin, and Middle English. Capital Barcelona Official languages Spanish and Catalan In Val dAran, also Aranese. ... Medieval Latin refers to the Latin used in the Middle Ages, primarily as a medium of scholarly exchange and as the liturgical language of the medieval Roman Catholic Church. ... Middle English is the name given by historical linguistics to the diverse forms of the English language spoken between the Norman invasion in 1066 and the mid-to-late 15th century, when the Chancery Standard, a form of London-based English, began to become widespread, a process aided by the...


It was, along with orpiment, a significant item of trade in the ancient Roman Empire and was used as a pigment and a medicine. It was also used as a medicine in China and "is made up into household ornaments, such as wine pots, wine cups, images, paperweights, and various other kinds of ornamanets and charms, to be kept near at hand in use, or worn about the person, with a view of warding off disease." Orpiment Orpiment prepared as a paint pigment Orpiment is a common monoclinic crystalline mineral Chemical Composition: As2S3, arsenic trisulfide Molecular Weight: 246. ... For other senses of this name, see Roman Empire (disambiguation). ... In biology, pigment is any material resulting in color in plant or animal cells which is the result of selective absorption. ...


On long exposure to light it disintegrates into a yellow powder known as pararealgar. It was once thought that this powder was the yellow orpiment, but has been recently shown to be the yellow-orange pararealgar.


Realgar, orpiment, and arsenopyrite provide nearly all the world's supply of arsenic as a byproduct of smelting concentrates derived from these ores. Arsenopyrite is an iron arsenic sulfide (FeAsS). ... General Name, Symbol, Number arsenic, As, 33 Chemical series metalloids Group, Period, Block 15, 4, p Appearance metallic gray Atomic mass 74. ... Chemical reduction, or smelting, is a form of extractive metallurgy. ... Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ...


Realgar is also used by firework manufacturers to create the color white in fireworks, manufacturing shot, printing and dyeing calico, and depilating and tanning hides.


References

  • The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals. 11th Edition. Ed. Susan Budavari. Merck & Co., Inc., N.J., U.S.A. 1989.
  • William Mesny. Mesny’s Chinese Miscellany. A Text Book of Notes on China and the Chinese. Shanghai. Vol. III, (1899), p. 251; Vol. IV, (1905), pp. 425-426.

External links


  Results from FactBites:
 
Realgar - Wikipedia, the free encyclopedia (259 words)
Realgar is soft with a Mohs hardness of 1.5 to 2 and has a specific gravity of 3.5.
Realgar, orpiment, and arsenopyrite provide nearly all the world's supply of arsenic as a byproduct of smelting concentrates derived from these ores.
Realgar is also used by firework manufacturers to create the color white in fireworks, manufacturing shot, printing and dyeing calico, and depilating and tanning hides.
REALGAR - LoveToKnow Article on REALGAR (278 words)
The name realgar is of Arabic origin, and was used /.
It is deposited by the solfataras near Naples and by the hot springs of the Yellowstone National Park.
Realgar has been used as a pigment and in pyrotechny for producing a brilliant white fire; but it is now replaced by the artificially prepared compound.
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