Difference between revisions of "Jasper"

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{{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
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
Imperial Jasper Cabochon, Mexico
Photo courtesy of Rick Martin