sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, varies in color including yellow, brown, red, green, and orange, exhibits a dull to greasy luster, cryptocrystalline crystal structure, no cleavage with distinctive 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, varies in color including yellow, brown, red, green, and orange, exhibits a dull to greasy luster, cryptocrystalline crystal structure, no cleavage with distinctive conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids replace organic material or fill cavities, occurring across various geological time scales from Precambrian to Cenozoic.
Uses & applications
Used for making ornamental objects, cabochons, polished stones, jewelry, and historically for stone tools and weapons due to its conchoidal fracture.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create seals, talismans, and primitive tools. The name means 'spotted or speckled stone'.
Field identification & locations
Identified easily by its smooth conchoidal fracture, microcrystalline texture, opacity, and vivid earthy colors. Commonly found worldwide in riverbeds, nodular deposits, and hydrothermal veins.
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