sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2 with iron oxide impurities)
Hardness of 6.5 to 7 on the Mohs scale, colors typically red, brown, yellow, or green due to iron and other mineral impurities, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors typically red, brown, yellow, or green due to iron and other mineral impurities, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich sediments or volcanic ash that underwent diagenesis, where silica precipitated in marine environments or hydrothermal solutions, often dating back millions of years.
Uses & applications
Commonly used in lapidary arts, tumbled stones, cabochons for jewelry, decorative carvings, and as a popular collector's mineral.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone' and originates from Greek.
Field identification & locations
Easily identified by its opaque nature, hardness that scratches glass, lack of cleavage, and distinct multicolored patterns. Found worldwide, particularly in regions with ancient volcanic or sedimentary activity.
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