sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brownish-yellow color, waxy to dull luster, cryptocrystalline or microcrystalline structure, 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, reddish-brown to brownish-yellow color, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition and accumulation of silica-rich sediments or volcanic ash in marine environments, often rich in iron oxide impurities which impart the distinctive red and brown hues.
Uses & applications
Used in ornamental carvings, cabochons for jewelry, decorative objects, and as a polishing stone.
Geological facts
Jasper has been utilized by ancient civilizations for thousands of years to create tools, seals, and talismans, frequently mentioned in ancient lapidary texts.
Field identification & locations
Easily identified by its opaque nature, smooth waxy feel when polished by water, and rich earthy colors; commonly found in riverbeds, beaches, and areas with ancient hydrothermal activity worldwide.
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