sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on the Mohs scale, red to brown or multi-colored, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity 2.58-2.91.
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Physical properties
Hardness 6.5-7 on the Mohs scale, red to brown or multi-colored, waxy to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity 2.58-2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary or volcanic environments, often involving iron oxide impurities that create the reddish coloration.
Uses & applications
Used extensively in lapidary work, ornamental carvings, cabochons, and gemstone jewelry.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, prized by ancient civilizations like the Egyptians and Minoans.
Field identification & locations
Easily identified by its opaque nature, vibrant red or variegated colors, and conchoidal fracture. Found worldwide in riverbeds, hydrothermal veins, and sedimentary deposits.
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