realgar
- Empirical Formula: As2S2
- Molecular Weight: 0
- Update Date: 2025-10-23 17:25:30
What is realgar?
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.
Properties of realgar
| Density | 3.5~3.6g/cm3 |
Safety information for realgar
Computed Descriptors for realgar
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