sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, variety of colors including red, brown, yellow, and green, conchoidal fracture, specific gravity of 2.55-2.70.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, variety of colors including red, brown, yellow, and green, conchoidal fracture, specific gravity of 2.55-2.70.
Formation & geological history
Forms from silica-rich solutions in sedimentary or volcanic environments, often resulting from the deposition of silica in rock cracks or cavities during hydrothermal activity or diagenesis.
Uses & applications
Used in ornamental objects, cabochons, carvings, jewelry, and lapidary arts.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its diverse patterns and colors are caused by different mineral impurities like iron oxides.
Field identification & locations
Found worldwide in riverbeds, hydrothermal veins, and sedimentary deposits. Identified by its hardness, opacity, and waxy luster compared to common quartz.
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