sedimentary

Red Jasper (River Pebble)

Silicon Dioxide (SiO2) with Hematite impurities

Hardness: 6.5-7 (Mohs scale); Color: Opaque brick red to brownish-red; Luster: Dull to sub-vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque brick red to brownish-red
Luster: Dull to sub-vitreous

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash, occurring within sedimentary or volcanic environments. This specific specimen has been smoothed and rounded by long-term water erosion in a river or beach setting.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons, beads), decorative tumbled stones, and as a healing stone in metaphysical practices.

Geological facts

Red jasper has been used for thousands of years; Ancient Egyptians associated it with the blood of Isis and used it in amulets. Its red color is derived from high concentrations of iron oxide (Hematite).

Field identification & locations

Identify by its opaque red color, smoothness from water wear, and inability to be scratched by a steel knife. It is commonly found in gravel beds, riverbanks, and coastlines worldwide.

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Brown Sandstone (River Rock)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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