Petzite
Mineral Ag3AuTe2
About it
Dark steel grey silver-gold telluride, usually massive with other tellurides in gold ores. Found at Cripple Creek, Colorado, and Kalgoorlie, Western Australia.
- Type
- Mineral
- Group
- Telluride
- Formula
- Ag3AuTe2
- Hardness (Mohs)
- 2.5–3
- Specific gravity
- 8.7–9.2
- Streak
- iron black
- Lustre
- metallic
- Crystal system
- Isometric (cubic)
- Colours
- steel grey, iron black, tarnishing
- Transparency
- opaque
- Cleavage and fracture
- none; subconchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.