mineral
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically Mohs 6.5–7; brick-red to orange-red, opaque, with a vitreous to waxy luster and no visible cleavage. The specimen appears tumbled or polished and may have a surface coating or residue.
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Physical properties
Typically Mohs 6.5–7; brick-red to orange-red, opaque, with a vitreous to waxy luster and no visible cleavage. The specimen appears tumbled or polished and may have a surface coating or residue.
Formation & geological history
Forms when silica-rich groundwater replaces or fills cavities in volcanic and sedimentary rocks, incorporating iron minerals; deposits range from Precambrian to recent. Common worldwide, including India, Brazil, Madagascar, the United States, and Australia.
Uses & applications
Used for cabochons, beads, carvings, tumbling, ornaments, and decorative stone; occasionally used as an aggregate or facing material.
Geological facts
Jasper is technically a rock rather than a single pure mineral because it commonly contains quartz, chalcedony, hematite, goethite, and clay minerals.
Field identification & locations
Identify by its opaque red-orange color, very fine texture, lack of cleavage, and ability to scratch glass; it should not fizz in dilute acid. A small tumbled piece is commonly worth about $2–$15 USD, depending on pattern and finish.
