sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown to deep brick red with fine quartz veins or dark micro-fractures; Luster: Vitreous to dull/waxy when beach-worn; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Luster: Vitreous to dull/waxy when beach-worn

Identified July 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of microcrystalline quartz along with iron oxides (hematite), which give it its characteristic red color, often in marine sedimentary environments or as secondary vein fillings in altered igneous rocks.

Uses & applications

Used widely in lapidary arts for cabochons, beads, decorative carvings, and tumbling, as well as in ornamental landscaping and crystal collection.

Geological facts

Red jasper has been used since antiquity; ancient Egyptians associated it with the blood of Isis and carved it into protective amulets and seals.

Field identification & locations

Identify in the field by its rich red color, high hardness (cannot be scratched by steel), fine-grained opaque texture, and smooth beach-worn shape. Commonly found along rivers, coastal beaches, and gravel deposits worldwide.