mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, opaque, with a polished glossy luster and no visible cleavage. Microcrystalline quartz; specific gravity about 2.6.

Identified October 13, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; reddish-brown, opaque, with a polished glossy luster and no visible cleavage. Microcrystalline quartz; specific gravity about 2.6.

Formation & geological history

Forms when silica-rich fluids fill or replace rock cavities and sediments; iron impurities create the red color. Jasper deposits occur in rocks of many ages.

Uses & applications

Commonly tumbled for jewelry, beads, and decorative pieces; also collected as an ornamental stone.

Geological facts

Jasper is a trade name for patterned, opaque chalcedony; its colors and markings vary with mineral impurities.

Field identification & locations

Look for a dense, opaque red stone with a smooth, waxy-to-glassy polish; common sources include India, Brazil, and the United States. The image shows a small tumbled specimen.