sedimentary

Red Jasper (Poppy Jasper variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red with yellow or orange orbicular spots; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal) microcrystalline; Specific Gravity: 2.58-2.91

Hardness: 6
Luster: Vitreous to waxy (when polished)

Identified April 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when silica-rich fluids permeate porous sediment or volcanic ash, combined with iron oxides which provide the red color. 'Poppy' varieties often form in areas with high tectonic activity that creates brecciated zones.

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and carvings; ornamental jewelry; and as a decorative stone in fish tanks or landscaping.

Geological facts

Red Jasper has been used since antiquity; it was a favorite in the ancient world, mentioned in biblical texts and used in Viking sword hilts for courage in battle.

Field identification & locations

Identify by its opaque nature (it does not transmit light even on thin edges) and its dull, earthy appearance until polished. Commonly found in riverbeds or coastal rocky outcrops in locations like California, India, and Madagascar.

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Sandstone or Siltstone

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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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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Shale or Slaty Mudstone

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Sandstone

Arenite (primarily SiO2)

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