Difference between revisions of "Jasper"
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+ | [[Image:Imperial_Jasper,_Mexico.JPG|left|framed|Imperial Jasper Cabochon, Mexico <br /> Photo courtesy of Rick Martin]]<br clear="left" /> |
Revision as of 06:13, 9 January 2007
Jasper | |
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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 |