Sedimentary
Jasper
SiO2
Hardness 6.5-7, various colors, dull to vitreous luster, cryptocrystalline structure
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Physical properties
Hardness 6.5-7, various colors, dull to vitreous luster, cryptocrystalline structure
Formation & geological history
Formed from silica-rich fluids in sedimentary environments
Uses & applications
Used in jewelry, decorative items, and carving
Geological facts
Jasper is an opaque, impure variety of silica
Field identification & locations
Identified by its hardness and conchoidal fracture
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Sandstone
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