Jasper
From The Gemology Project
Revision as of 06:13, 9 January 2007 by Africanuck (talk | contribs)
Jasper | |
---|---|
Chemical composition | SiO2 Silicon dioxide |
Crystal system | Trigonal |
Habit | Aggregate, massive |
Fracture | Conchoidal |
Hardness | 6.5-7 |
Refractive index | 1.53-1.54 |
Specific gravity | 2.58-2.64 |
Lustre | Vitreous |