sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency, waxy to dull luster, and conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron oxide impurities, opaque transparency, waxy to dull luster, and conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich sediments or silica-bearing solutions in marine or terrestrial environments, often hardened and lithified over millions of years.
Uses & applications
Commonly used in lapidary arts, making cabochons, beads, ornamental carvings, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Can be identified by its opaque nature, hardness, waxy luster, and distinctive reddish-brown coloration from iron inclusions. Found worldwide in riverbeds, ancient marine deposits, and volcanic regions.
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