Tiemannite
Mineral HgSe
Take care.
- Contains mercury: Wash your hands after handling it, and never heat it: the fumes are poisonous.
About it
Dark grey mercury selenide, usually massive or as small tetrahedrons. Named for Wilhelm Tiemann; first found in the Harz, Germany.
- Type
- Mineral
- Group
- Selenide, sphalerite group
- Formula
- HgSe
- Hardness (Mohs)
- 2.5
- Specific gravity
- 8.1–8.5
- Streak
- black
- Lustre
- metallic
- Crystal system
- Isometric (cubic)
- Colours
- steel grey, blackish lead grey
- Transparency
- opaque
- Cleavage and fracture
- none; uneven to conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.