Pararealgar
Mineral As4S4
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
- Fragile: Handle it gently and pack it well; it breaks or crumbles easily.
About it
The yellow-orange powder that forms when realgar is left in light; a mineral in its own right. Common on old realgar specimens in collections, and found naturally with realgar in the field.
- Type
- Mineral
- Group
- Sulfide
- Formula
- As4S4
- Hardness (Mohs)
- 1–1.5
- Specific gravity
- 3.5–3.6
- Streak
- bright yellow to orange-yellow
- Lustre
- resinous, vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- yellow, orange-yellow
- Transparency
- translucent
- Cleavage and fracture
- none; powdery crusts and grains
Typical values: real specimens vary. For more, see mindat.org.