Lorandite
Mineral TlAsS2
Take care.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Deep red thallium arsenic sulfide, the signature mineral of Allchar (Alšar), North Macedonia, where it was studied as a natural detector of solar neutrinos. Thallium makes it highly toxic.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- TlAsS2
- Hardness (Mohs)
- 2–2.5
- Specific gravity
- 5.5–5.6
- Streak
- cherry red
- Lustre
- adamantine (diamond-like), submetallic
- Crystal system
- Monoclinic
- Colours
- cherry red, dark red
- Transparency
- transparent, translucent
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.