mineral
Tumbled red jasper (likely)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque reddish pink, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates tumbling and polishing.
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Physical properties
Opaque reddish pink, fine-grained, waxy to dull luster, no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded shape indicates tumbling and polishing.
Formation & geological history
Forms when silica-rich groundwater fills cavities or replaces sediments and volcanic material, with iron producing the red color; deposits range from Precambrian to younger ages. Exact age and locality cannot be determined from the image.
Uses & applications
Used for inexpensive cabochons, beads, carvings, tumbled stones, and decorative objects; occasionally used as ornamental stone. Typical value is about $1–$10 for a small tumbled piece, or $10–$50 for especially attractive material.
Geological facts
Jasper is a variety of opaque chalcedony rather than a single mineral species; patterns and color depend on iron-oxide inclusions and impurities.
Field identification & locations
Identify it by its opaque red color, very fine texture, lack of cleavage, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.
