pararealgar
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Pararealgar is an arsenic sulfide mineral with the chemical formula , also represented as AsS. It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, . It is soft with a Mohs hardness of 1 - 1.5, is yellow orange in colour, and its monoclinic prismatic crystals are very brittle, easily crumbling to powder.
Wikidata facts
- Subclass of
- sulfide class of minerals
- Named after
- realgar
- Image
- Bonazziite.jpg
Show 6 more facts
- crystal system
- monoclinic crystal system
- Nickel-Strunz 9th edition (updated 2009)
- 2.FA.15b
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.FA.15b
- Commons category
- Pararealgar
- chemical formula
- As₄S₄
- IMA Mineral Symbol
- Prlg
Sources (2)
via Wikidata · CC0
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Encyclopedic overview
4 sectionsContents
- Structure
- Occurrence
- Formation
- References
Pararealgar is an arsenic sulfide mineral with the chemical formula , also represented as AsS. It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, . It is soft with a Mohs hardness of 1 - 1.5, is yellow orange in colour, and its monoclinic prismatic crystals are very brittle, easily crumbling to powder.
It is one of the sulfides of arsenic and is one of two isomers of . It forms upon exposure of the symmetrical isomer to light. Its name derives from the fact that its elemental composition is identical to realgar, .
Excerpted from Wikipedia’s “pararealgar” article, available under the CC BY-SA 4.0 licence.