sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown color, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown color, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments or volcanic ash deposits, often precipitated out of water in marine or lacustrine basins.
Uses & applications
Used for ornamental objects, cabochons, jewelry, carvings, and as a collector's specimen.
Geological facts
Jasper has been used throughout human history since ancient times for seals, signet rings, and various decorative and spiritual tools.
Field identification & locations
Identified by its opaque appearance, conchoidal fracture showing sharp edges, lack of cleavage, and ability to scratch glass.
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