mineral

Red jasper (likely polished/tumbled)

Jasper, an opaque microcrystalline variety of quartz; mainly SiO₂ with iron-oxide inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque red to orange-red, with a glassy to dull/waxy luster and no visible cleavage; cryptocrystalline quartz structure, specific gravity about 2.5–2.9.

Identified August 29, 2026More mineral →

Explore Red jasper (likely polished/tumbled) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Typically Mohs hardness 6.5–7, opaque red to orange-red, with a glassy to dull/waxy luster and no visible cleavage; cryptocrystalline quartz structure, specific gravity about 2.5–2.9.

Formation & geological history

Forms when silica-rich fluids cement or replace volcanic ash, sediment, or other rock, with iron oxides producing the red color; specimens range from Precambrian to recent geological settings.

Uses & applications

Used for beads, cabochons, carvings, tumbled stones, ornamental objects, and minor decorative aggregate; common polished pieces usually have modest value.

Geological facts

The red coloration is caused mainly by hematite or other iron oxides. Jasper is technically a rock rather than a single mineral, despite its quartz-dominated composition.

Field identification & locations

Identify it by its opaque red color, smooth polish, fine texture, and inability to scratch easily with a steel blade; common sources include India, Madagascar, Brazil, Uruguay, and the western United States.