sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Hardness: 6.5-7 Mohs; Color: Brick red to brownish red; Luster: Vitreous to waxy (especially when polished); Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Specific Gravity: 2.6-2.9; Cleavage: None (conchoidal fracture)

Hardness: 6
Color: Brick red to brownish red
Luster: Vitreous to waxy (especially when polished)

Identified July 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via the accumulation of silica-rich microfossils or precipitation from hydrothermal fluids, often in proximity to volcanic activity. The red color comes from iron inclusions (hematite). Many specimens are found as river-worn pebbles.

Uses & applications

Widely used for ornamental purposes, lapidary art, jewelry (cabochons and beads), and as a popular stone for rock tumbling and collecting.

Geological facts

Red Jasper has been used since antiquity, appearing in Minoan seals on Crete. It is mentioned in diverse cultural histories and was often worn by warriors for protection and courage.

Field identification & locations

Identified in the field by its opaque red color, smoothness, and extreme hardness (it will easily scratch glass). Common in river beds and coastal areas globally, notably in the USA, India, and Brazil.

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