sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
Hardness of 6.5-7 on the Mohs scale, opaque luster (waxy to dull), brown color, conchoidal fracture with no visible cleavage, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster (waxy to dull), brown color, conchoidal fracture with no visible cleavage, specific gravity of 2.58-2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments or volcanic ash deposits, often precipitated from hydrothermal fluids or silica-rich groundwater over millions of years.
Uses & applications
Used for ornamental objects, cabochons, polished stones, jewelry, and gemstone carving.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Brown jasper is often associated with grounding and stability in crystal healing traditions.
Field identification & locations
Can be identified in the field by its opaque brown or earthy tones, hardness that scratches glass, and smooth conchoidal breakage. Commonly found in riverbeds, gravel deposits, and mountainous regions worldwide.
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