Sard
From The Gemology Project
Revision as of 11:18, 18 October 2006 by Africanuck (talk | contribs)
Agate | |
---|---|
Chemical composition | SiO2 Silicon dioxide |
Crystal system | Trigonal |
Habit | Aggregate |
Fracture | Conchoidal |
Hardness | 6.5-7 |
Refractive index | ± 1.54 |
Specific gravity | 2.60 |
Lustre | Vitreous |