sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or green, vitreous to dull luster, cryptocrystalline structure with 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 brown, red, yellow, or green, vitreous to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity around 2.58 to 2.91.
Formation & geological history
Formed by the precipitation of silica from aqueous solutions, often within cavities of volcanic rocks or within sedimentary layers, typically during the Precambrian to Cenozoic eras.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and lapidary art.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in ancient lapidary texts for its grounding properties.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and ancient seabeds; identified by its opaque nature, high hardness, and waxy to dull finish.
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