mineral

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; brick-red to brown with black or gray inclusions, vitreous to waxy luster, cryptocrystalline quartz structure, and no visible cleavage. The smooth rounded surface indicates tumbling or polishing.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediments, volcanic ash, or cavities, with iron oxides producing the red color; specimens range from Precambrian to relatively young geological settings. Common sources include India, Madagascar, Brazil, South Africa, and the western United States.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and lapidary objects; historically used for tools and decorative stone. It is durable but less valuable than transparent quartz gemstones.

Geological facts

Jasper is technically a rock rather than a single mineral, although quartz is its dominant component. Patterns and inclusions vary widely, making individual pieces attractive to collectors.

Field identification & locations

Identify it by its opaque red color, fine-grained texture, iron-oxide speckling, lack of cleavage, and ability to scratch glass; it will not show crystal faces or strong translucence. Common field varieties include red, picture, ocean, and brecciated jasper.