sedimentary

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with occasional yellow or black streaks, Luster: Vitreous to waxy (when polished), Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine volcanic ash or silica-rich sediment that replaces other materials over millions of years. It often occurs as nodules or in veins in volcanic rocks or sedimentary environments.

Uses & applications

Used primarily for ornamental purposes, jewelry (beads, cabochons), lapidary art, and as a popular stone for collectors or spiritual practices.

Geological facts

Jasper is an opaque variety of chalcedony. The red color is caused by the presence of iron oxide (hematite) during its formation. It has been used since antiquity for royal seals and amulets.

Field identification & locations

Identify in the field by its opaque nature, smooth waxy texture, and its ability to scratch glass while resisting a steel knife. Commonly found in riverbeds or gravel deposits in locations like India, Brazil, and the Southwestern USA.

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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