Nagyagite
Mineral [Pb3(Pb,Sb)3S6](Au,Te)3
Also called Black tellurium
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
About it
Soft, blackish lead-grey thin plates with a perfect cleavage, an ore of gold. Named for Nagyág, now Săcărâmb, Romania, its classic source.
- Type
- Mineral
- Group
- Sulfotelluride
- Formula
- [Pb3(Pb,Sb)3S6](Au,Te)3
- Hardness (Mohs)
- 1–1.5
- Specific gravity
- 7.4–7.6
- Streak
- blackish lead grey
- Lustre
- metallic
- Crystal system
- Monoclinic
- Colours
- blackish lead grey
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction, flexible plates
Typical values: real specimens vary. For more, see mindat.org.