sedimentary

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Hardness: 6.5-7 on the Mohs scale. Color: Brick red, brownish-red, sometimes with dark veins or inclusions due to iron oxide. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.

Hardness: 6
Luster: Vitreous to dull

Identified August 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the hydrothermal deposition of silica-rich fluids or accumulation of silica-rich radiolarian ooze, heavily pigmented by iron oxides during sedimentation and diagenesis.

Uses & applications

Used widely for ornamental carvings, polished cabochons, beads, jewelry, and lapidary work.

Geological facts

Jasper has been used since ancient times for amulets, seals, and weaponry by civilizations such as the Egyptians, Greeks, and Native Americans. It is mentioned in various historical and biblical texts for its protective properties.

Field identification & locations

Easily identified by its opaque red color, waxy luster, and high hardness (scratches glass). Commonly found in stream beds, river gravels, and metamorphic or sedimentary formations worldwide.

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