metamorphic
Red jasper pebble
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
AI-generated identification · may be incorrectOpaque burgundy-red to purplish, dull-to-waxy luster, fine-grained massive texture, and no visible cleavage; hardness about 6.5–7 Mohs, specific gravity roughly 2.6. The rounded form indicates natural water abrasion or tumbling, with pale weathering veins/surfaces.
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Physical properties
Opaque burgundy-red to purplish, dull-to-waxy luster, fine-grained massive texture, and no visible cleavage; hardness about 6.5–7 Mohs, specific gravity roughly 2.6. The rounded form indicates natural water abrasion or tumbling, with pale weathering veins/surfaces.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement fine sediments, commonly with hematite or other iron oxides producing the red color. It may form in volcanic or sedimentary environments over varied geological ages, commonly Paleozoic to younger.
Uses & applications
Used as ornamental stone, beads, cabochons, carvings, bookends, and tumbled specimens; occasionally as a minor aggregate or facing stone. This example has modest jewelry or display value.
Geological facts
Jasper is an opaque variety of chalcedony and is technically microcrystalline quartz rather than a single distinct mineral species. Color patterns and names such as “red jasper” are primarily descriptive trade classifications.
Field identification & locations
Identify it by its opaque red color, very fine texture, glass-scratching hardness, and lack of visible quartz crystals; it should not fizz in dilute acid. Common in gravel deposits and iron- and silica-rich volcanic or sedimentary terrains worldwide.
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