16.6.1.4: Carnelian
( \newcommand{\kernel}{\mathrm{null}\,}\)
Carnelian | |
---|---|
Chemical composition | Silicon dioxide SiO2 |
Crystal system | Trigonal |
Habit | Aggregate |
Hardness | 6.5 - 7 |
Refractive index | ± 1.54 |
Specific gravity | 2.55 - 2.70 |
Lustre | Vitreous |
Figure 16.6.1.4.1: Carnelian cabochon