mineral

Red-and-cream jasper

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, red, pink, and cream, with a dull to slightly waxy luster and no visible cleavage; microcrystalline quartz has very fine interlocking grains. The rough, naturally irregular surface suggests an unpolished specimen.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediments and volcanic material, with iron oxides producing the red coloration; ages vary widely, commonly Precambrian to younger. This specimen may also be brecciated or iron-stained chert rather than uniform jasper.

Uses & applications

Used for carvings, cabochons, beads, decorative stone, and lapidary work; massive material is occasionally used as ornamental rock. It is generally a collector or craft stone rather than a construction aggregate.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. Red coloration commonly reflects hematite or other ferric iron minerals.

Field identification & locations

Identify it by its opaque red coloration, cream patches, hardness, and resistance to scratching by a steel blade; it should not fizz in dilute hydrochloric acid unless carbonate is present. Common sources include India, Madagascar, Brazil, Australia, the western United States, and Mexico.