sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, colors range from red, yellow, brown to green, vitreous to dull luster, cryptocrystalline structure with no distinct cleavage, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, colors range from red, yellow, brown to green, vitreous to dull luster, cryptocrystalline structure with no distinct cleavage, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the accumulation of silica-rich sediments or silica-bearing solutions replacing other minerals in sedimentary or volcanic environments, often over millions of years.
Uses & applications
Used primarily in ornamental carvings, polished cabochons for jewelry, and as a collector specimen.
Geological facts
Jasper has been used by ancient civilizations since prehistoric times for tools, seals, and ornamentation, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Can be identified in the field by its conchoidal fracture, waxy luster, and opaque, vividly colored patterns. Found worldwide in riverbeds, ancient marine deposits, and volcanic regions.
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