sedimentary

Red Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep terracotta
Luster: Vitreous to dull

Identified April 9, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of silica-rich sediments or volcanic ash that undergo lithification and intense pressure. The red color is derived from iron (hematite) inclusions during hydrothermal processes.

Uses & applications

Used widely in lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a decorative stone in landscaping. Historically used for seals and amulets.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Greek, Hebrew, and Persian languages. It is often called the 'supreme nurturer' in metaphysical circles.

Field identification & locations

Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or as eroded nodules in desert regions.