Chrome chalcedony
Variety SiO2
Also called Mtorolite
About it
Chalcedony coloured green by chromium, cooler and deeper than nickel-green chrysoprase, and red under a Chelsea filter. Known from Zimbabwe, where it is called mtorolite, and from Turkey.
- Type
- Variety
- Group
- Quartz variety (chalcedony)
- Formula
- SiO2
- Hardness (Mohs)
- 6.5–7
- Specific gravity
- 2.57–2.64
- Streak
- white
- Lustre
- waxy, vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- emerald green
- Transparency
- translucent
- Cleavage and fracture
- none; conchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.