sedimentary
Jasper
Silicon Dioxide (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically opaque, vitreous to dull luster, microcrystalline quartz structure, uneven or conchoidal fracture, specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically opaque, vitreous to dull luster, microcrystalline quartz structure, uneven or conchoidal fracture, specific gravity around 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine basins over millions of years.
Uses & applications
Used primarily in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its name comes from the ancient Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Can be identified in the field by its waxy luster, opaque nature, and lack of cleavage. Common in stream gravels and ancient riverbeds worldwide.
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