mineral
Jasper (likely brecciated jasper)
Microcrystalline quartz, SiO₂, colored by iron oxides
AI-generated identification · may be incorrectOpaque, mottled reddish-brown with gray-blue patches and a dull to waxy luster; quartz hardness about 6.5–7 Mohs, trigonal crystal structure, no cleavage. The rounded, rough specimen appears unpolished.
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Physical properties
Opaque, mottled reddish-brown with gray-blue patches and a dull to waxy luster; quartz hardness about 6.5–7 Mohs, trigonal crystal structure, no cleavage. The rounded, rough specimen appears unpolished.
Formation & geological history
Jasper forms as silica-rich material hardens in sedimentary or volcanic settings; iron oxides create its colors. Its exact age and geological source cannot be determined from the image.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; larger or patterned pieces may be polished for display.
Geological facts
Jasper is a variety of chalcedony, composed of extremely fine quartz crystals; brecciated patterns form when silica cements fragments together.
Field identification & locations
Look for opaque color, mottling, and a hardness sufficient to scratch glass; jasper occurs worldwide, commonly in iron-rich sedimentary and volcanic rocks. A photo alone cannot confirm the identification.
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