mineral

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Opaque, reddish-brown with a pale quartz/chalcedony-like band; dull to slightly waxy luster and conchoidal fracture. Mohs hardness 6.5–7; no cleavage; cryptocrystalline quartz structure; specific gravity about 2.5–2.7.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace volcanic ash, sediments, or fractures, with iron oxides producing the red color. Deposits range from Precambrian to recent, and this piece has been mechanically polished or tumbled.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornamental objects, and lapidary practice; occasionally as aggregate or decorative stone.

Geological facts

Jasper is technically a variety of chalcedony or microcrystalline quartz, though many commercial jaspers contain minor hematite, clay, or other inclusions. The pale stripe may indicate brecciation, veining, or layered deposition.

Field identification & locations

Identify it by its opaque red color, fine texture, lack of visible crystals, and ability to scratch glass; it should not fizz in dilute hydrochloric acid. Common sources include India, Madagascar, Brazil, the United States, and Australia.