Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
monoclinicuncommonsulfides
Realgar
AsS
This specimen displays a vibrant orange-red crystalline mass of realgar, exhibiting a resinous to greasy luster with some translucent areas.
Realgar Physical Properties
Mohs Hardness
1.5Crystal System
monoclinicLuster
resinousStreak Color
orange-redCleavage
good on {010}, poor on {101} and {100}Fracture
conchoidalSpecific Gravity
3.56Colors
orange-red, red, yellowish-orangeTransparency
transparentType Locality
Getchell Mine, Adam Peak, Potosi District, Humboldt County, Nevada, USAMineral Group
sulfidesUses
collector, minor ore of arsenic, historical pigmentAssociated Minerals
orpiment, stibnite, cinnabar, arsenopyrite, galena, pyrite, calcite, bariteRarity
uncommonGeological Context
Realgar typically forms in low-temperature hydrothermal veins, hot spring deposits, and volcanic fumaroles. It is often found in association with other arsenic minerals, particularly orpiment, in epithermal ore deposits.
