sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Hardness: 6.5-7 (Mohs scale), Color: Dull red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic rocks or sediment. The red color is caused by the inclusion of iron oxide (hematite) during its formation. It can be found in a variety of geological ages, often as nodules or vein fillings.

Uses & applications

Widely used in jewelry for cabochons and beads, as an ornamental stone in decorative carvings, and frequently collected as a tumbled stone or lapidary material. Historically used for seals and amulets.

Geological facts

The name jasper is derived from the Greek word 'iaspis', meaning spotted stone. It was once considered a precious stone in the ancient world, mentioned in biblical texts and used in the breastplates of high priests.

Field identification & locations

Identify in the field by its opaque red color, smooth waxy texture, and sharp shell-like (conchoidal) edges when broken. It is a common find in riverbeds and desert environments, particularly in India, Brazil, and the Southwestern USA.

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