Sylvanite
Mineral AgAuTe4
Also called Graphic tellurium
About it
Silver-white to steel grey blades, often laid out like writing on the rock. Named for Transylvania; found at Baia de Arieș, Romania, Cripple Creek, Colorado, and Kalgoorlie, Western Australia.
- Type
- Mineral
- Group
- Telluride
- Formula
- AgAuTe4
- Hardness (Mohs)
- 1.5–2
- Specific gravity
- 8–8.2
- Streak
- steel grey
- Lustre
- metallic
- Crystal system
- Monoclinic
- Colours
- steel grey, silver white, brassy
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.