sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Brick-red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified May 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often associated with hydrothermal activity. Its red color is derived from high concentrations of iron inclusions.

Uses & applications

Used primarily for lapidary work, jewelry (beads, cabochons), ornamental sculpture, and as a popular stone for collectors and metaphysical practitioners.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Greek, and Latin words. It is one of the traditional birthstones for March.

Field identification & locations

Identify in the field by its opaque nature (unlike carnelian which is translucent), its smooth waxy feel when polished, and its inability to be scratched by a steel knife. Common in the western USA, Brazil, and India.