sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster, highly variable colors due to impurities, and a conchoidal fracture with no cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, highly variable colors due to impurities, and a conchoidal fracture with no cleavage.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary or volcanic environments over millions of years.
Uses & applications
Widely used for ornamental objects, carved gemstones, cabochons, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, with references dating back to early Mesopotamian cultures.
Field identification & locations
Identified easily by its opaque appearance, waxy luster, and high hardness that scratches glass; commonly found in riverbeds and mountainous regions worldwide.
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