mineral

Red jasper (likely polished/tumbled)

Jasper, microcrystalline quartz/chalcedony (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Typically opaque red to brick-red, with a waxy to vitreous polish and no visible crystals; Mohs hardness 6.5–7, conchoidal fracture, and specific gravity about 2.5–2.7. The rounded shape indicates human tumbling or polishing.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxides producing the red color. Deposits occur in many ages, commonly in Precambrian to younger volcanic terrains.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive jewelry; polished pieces are popular decorative and lapidary materials.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz rather than a separate mineral species. White specks or subtle patterns may reflect quartz, hematite, or other inclusions.

Field identification & locations

Identify by its opaque red color, very fine texture, glassy polish, and inability to scratch with a steel knife easily; glass or dyed stones can resemble it. Common sources include India, Madagascar, Brazil, the United States, and Australia.