mineral

Red jasper fragment

Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides

AI-generated identification · may be incorrect

Typically opaque red to brown, with a dull-to-waxy luster and conchoidal fracture; hardness about 6.5–7 Mohs, no cleavage, and specific gravity around 2.6. The small polished or naturally worn fragment appears consistent with iron-stained jasper, though the photograph is not diagnostic.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces sediments and volcanic rocks, with iron oxides producing the red color. Deposits occur in many ages, commonly in hydrothermal, volcanic, and sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and small decorative specimens; it has little industrial value compared with ordinary quartz aggregate.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz and often shows brecciation, banding, or orbicular patterns. Red coloration commonly comes from hematite or goethite inclusions.

Field identification & locations

Look for opacity, red-brown color, waxy surface, lack of cleavage, and resistance to scratching by a steel knife; glass should generally scratch similarly or less readily. Common localities include India, Brazil, Madagascar, Australia, South Africa, and the western United States.