sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale), Color: brick-red to deep brown-red, Luster: dull to vitreous, Crystal Structure: hexagonal (trigonal), Cleavage: none, Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale), Color: brick-red to deep brown-red, Luster: dull to vitreous, Crystal Structure: hexagonal (trigonal), Cleavage: none, Specific Gravity: 2.58-2.91

Formation & geological history

Formed primarily as a result of the replacement of fine-grained sediment or volcanic ash by silica-rich hydrothermal fluids. The red color comes from high concentrations of hematite (iron oxide). It is often found in sedimentary layers or volcanic vein deposits.

Uses & applications

Used extensively for lapidary work, including cabochons, beads, and carvings. Historically used for seals and decorative objects. Highly valued by collectors of metaphysical stones.

Geological facts

Known as the 'Stone of Endurance' in ancient cultures, it was often used in amulets for protection. It is a microcrystalline variety of quartz and is almost entirely opaque compared to other chalcedonies.

Field identification & locations

Identify by its characteristic dull, waxy, or earthy texture before polishing and its opaque nature. Unlike red glass, it will not have air bubbles. Commonly found in South Africa, Brazil, India, and across the USA (especially Oregon and Utah).