mineral

Polished red jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown with cream and gray veining, opaque, and typically dull to waxy with a smooth polished surface. It has a cryptocrystalline quartz structure and no cleavage; specific gravity is approximately 2.6–2.7.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace volcanic and sedimentary rocks, with iron producing the red coloration. Deposits are commonly Precambrian to younger, although the specimen’s exact age cannot be determined visually.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary practice; historically used for tools and decorative stone.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. The contrasting cream bands may reflect silica replacement, brecciation, or iron-rich alteration.

Field identification & locations

Identify it by its opaque red body color, fine texture, glass-scratching hardness, and lack of visible individual crystals; common sources include India, Madagascar, Brazil, the United States, and Australia. The pictured piece appears tumbled or polished.