gemstone

Red jasper

Microcrystalline quartz (chalcedony), predominantly SiO₂, colored red by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brick-red with darker veining, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded, glossy form appears tumbled or polished.

Identified September 8, 2026More gemstone →

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Physical properties

Hardness about 6.5–7 Mohs; opaque brick-red with darker veining, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded, glossy form appears tumbled or polished.

Formation & geological history

Forms when silica-rich groundwater fills fractures or replaces volcanic and sedimentary rocks, with iron oxidation producing the red color; deposits range from Precambrian to recent. Common sources include India, Brazil, Madagascar, Australia, South Africa, and the United States.

Uses & applications

Used for cabochons, beads, carvings, décor, and inexpensive jewelry; historically used for tools and seals. It is also collected as an attractive lapidary material.

Geological facts

Jasper is an opaque variety of chalcedony, unlike translucent agate. Red coloration generally reflects hematite or other iron-oxide inclusions.

Field identification & locations

Identify it by its opaque red body, fine grain, lack of cleavage, and ability to scratch glass; a streak test may show white rather than red. Look for natural granular or banded patterns rather than uniform plastic appearance.