sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brownish red; Luster: Vitreous to dull/waxy; Fracture: Conchoidal; Structure: Microcrystalline/Cryptocrystalline quartz; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep brownish red
Luster: Vitreous to dull/waxy

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when fine microcrystalline silica precipitates from volcanic thermal fluids or groundwater in sedimentary and igneous rocks, colored red by micro-inclusions of hematite or iron oxides.

Uses & applications

Used extensively for lapidary arts, cabochons, carved ornaments, tumbled gemstones, and decorative beads.

Geological facts

Red jasper has been used since ancient times for seals, amulets, and stone tools due to its fine-grained structure, hardness, and smooth conchoidal fracture.

Field identification & locations

Identified by its distinctive opaque red color, hardness that easily scratches steel, and smooth conchoidal fracture surface. Commonly found in gravel beds, stream deposits, and volcanic terrains worldwide.