Uvarovite
Mineral Ca3Cr2(SiO4)3
About it
Bright emerald-green chromium garnet in tiny sparkling crystals that coat chromite; drusy plates come from the Saranovskii mine in the Urals and from Outokumpu, Finland.
- Type
- Mineral
- Group
- Silicate (nesosilicate), garnet group
- Formula
- Ca3Cr2(SiO4)3
- Hardness (Mohs)
- 6.5–7.5
- Specific gravity
- 3.4–3.8
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Isometric (cubic)
- Colours
- emerald green, dark green
- Transparency
- transparent, translucent
- Cleavage and fracture
- none; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.