realgar Chemical Properties

Density 

3.5~3.6g/cm3

realgar Usage And Synthesis

Chemical Properties

Monoclinic crystal system, single crystals are fine columnar and needle-like. Orange-red color, the stripes are light orange-red. Adamantine luster, fracture is resin luster. Insoluble in water and hydrochloric acid, soluble in nitric acid.

Physical properties

Habit: prismatic, massive, granular, druse, earthy.
Color: aurora red, orange yellow, or dark red.
Diaphaneity: translucent to opaque.
Luster: resinous, glassy, adamantine.
Streak: orange red.
Cleavage: [010], [001], and [100].
Twinning: (100).
Fracture: brittle, sectile.
Chemical: dissolved by HNO3, evolved a garlic odor when calcinated and gives sublimated As2O3 deposit on cold wall.
Electrical resistivity 1 to 150 mΩ.m.
Occurrence: hydrothermal with orpiment. Marcasite, and stibine. Sedimentary rocks.

Definition

The mineral form of arsenic(II) sulfide, As₄S₄. It is bright red in color and used as a pigment, in tanning, and in pyrotechnics.

Definition

realgar: A red mineral form of arsenic(II) sulphide, As²S².