metamorphic

Red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown, earthy to dull/waxy luster, very fine-grained cryptocrystalline structure, no visible cleavage, and typically Mohs hardness 6.5–7; the rounded shape suggests natural abrasion or tumbling.

Identified September 3, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediment, volcanic ash, or existing rock, with iron oxides producing the red color. Deposits occur across many geological ages, commonly in Precambrian iron-rich formations and volcanic terrains.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and polished display stones; lower-grade material is inexpensive and occasionally used decoratively in landscaping.

Geological facts

Its red color commonly comes from hematite or goethite inclusions rather than red quartz itself. The specimen may also be iron-rich chert, a closely related material that can be difficult to distinguish visually.

Field identification & locations

Identify it by its opaque uniform red-brown color, extremely fine texture, conchoidal fracture, and ability to scratch glass; acid produces no fizz. Common sources include India, Madagascar, Brazil, Australia, South Africa, and the western United States.