sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7.0 (Mohs); Color: Terracotta red to deep brick red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Terracotta red to deep brick red
Luster: Dull to vitreous

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal fluids or in sedimentary environments where iron oxides (like hematite) are present during the lithification process. Often found in association with banded iron formations.

Uses & applications

Used in the lapidary arts for cabochons, beads, and carvings. Historically used for tools, seals, and as an ornamental stone in architecture and jewelry.

Geological facts

The red color is caused by the presence of iron oxide (hematite). In antiquity, red jasper was often associated with strength and vitality and was called the stone of endurance.

Field identification & locations

Identify in the field by its opaque red appearance, hardness (it will scratch glass), and smooth, waxy feel when polished. Commonly found in riverbeds, deserts, and volcanic regions globally, notably in the USA, India, and Brazil.

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Sandstone or Siltstone

Arenite (if sandstone)

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Argillite / Siliciclastic sedimentary rock

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Cone-in-cone structure (Limestone)

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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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