mineral
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque reddish-brown, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity ~2.5–2.9. The rounded shape indicates tumbling or natural water wear.
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Physical properties
Opaque reddish-brown, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity ~2.5–2.9. The rounded shape indicates tumbling or natural water wear.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic and sedimentary material, with iron producing the red color; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, South Africa, and the western United States.
Uses & applications
Used for cabochons, beads, carvings, polished stones, ornaments, and lapidary collections; occasionally used as an architectural or decorative stone.
Geological facts
Jasper is a variety of chalcedony or microcrystalline quartz, though its dense opaque texture distinguishes it from translucent agate. Patterns and color intensity depend on iron-oxide content and impurities.
Field identification & locations
Identify it by its opaque red coloration, very fine texture, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. The image alone cannot confirm whether it is jasper rather than another iron-rich silica rock.
