sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, various earthy colors often including red, brown, yellow, or green, vitreous to dull luster, conchoidal fracture, no true cleavage, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, various earthy colors often including red, brown, yellow, or green, vitreous to dull luster, conchoidal fracture, no true cleavage, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids precipitate microcrystalline quartz in pore spaces or fractures, often dating back millions of years.
Uses & applications
Used for ornamental objects, cabochons, carvings, jewelry, and by collectors.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, and is mentioned in various historical texts.
Field identification & locations
Easily identified in the field by its waxy luster, conchoidal fracture, and opaque earthy tones; found worldwide in association with iron formations and hydrothermal veins.
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