mineral
Red jasper (likely)
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
AI-generated identification · may be incorrectOpaque salmon-orange to red, fine-grained, matte to subtly waxy luster; quartz hardness about 6.5–7 Mohs, no visible cleavage, conchoidal-to-uneven fracture, specific gravity about 2.5–2.7. The specimen appears polished or naturally smoothed and may be iron-rich chalcedony rather than true jasper.
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Physical properties
Opaque salmon-orange to red, fine-grained, matte to subtly waxy luster; quartz hardness about 6.5–7 Mohs, no visible cleavage, conchoidal-to-uneven fracture, specific gravity about 2.5–2.7. The specimen appears polished or naturally smoothed and may be iron-rich chalcedony rather than true jasper.
Formation & geological history
Forms when silica-rich fluids cement volcanic ash, sediments, or fractures, with iron oxides producing the red-orange color; deposits range from Precambrian to relatively young geological ages. Commonly associated with volcanic and sedimentary environments.
Uses & applications
Used for cabochons, beads, carvings, tumbled stones, ornaments, and lapidary work; occasionally used as decorative aggregate. It is primarily a collectible and ornamental material.
Geological facts
Jasper is a variety of opaque chalcedony or microcrystalline quartz, and its colors commonly arise from hematite or goethite impurities.
Field identification & locations
Identify it by its opaque uniform color, fine texture, quartz-like hardness, and lack of cleavage; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Australia, and the western United States.
