sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown to brownish-red color with mottled patterns, waxy to dull luster, cryptocrystalline 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 to brownish-red color with mottled patterns, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often associated with iron-rich deposits. Geological age varies widely depending on the specific deposit.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its reddish coloration is primarily due to iron oxide inclusions.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and sedimentary rock formations. Identify in the field by its hardness, smooth water-worn surface, conchoidal fracture, and lack of reaction to acid.
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