sedimentary

Red Jasper (Quartzite conglomerate)

Silicon dioxide (SiO2) with Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Rusty red, brown to maroon, Luster: Dull to vitreous when wet, Crystal structure: Microcrystalline/Trigonal, Cleavage: None/Conchoidal fracture, Specific gravity: 2.58-2.91

Hardness: 6

Identified April 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich sediments or the chemical replacement of volcanic ash/limestone. The red color is derived from iron oxides (hematite) present during formation. These rocks can be found in terrains ranging from Precambrian to recent.

Uses & applications

Used primarily for ornamental purposes, lapidary arts (cabochons, beads), decorative garden stones, and historic use as flint for fire-starting.

Geological facts

Red jasper has been used for millennia; it was known as the 'rain-bringer' in many ancient cultures and was often featured in the jewelry of Egyptian pharaohs and Roman seals.

Field identification & locations

Identify in the field by its distinct red-orange hue, high hardness (cannot be scratched by a steel knife), and smooth, shell-like (conchoidal) fracture planes where it has been chipped. Commonly found in river beds or areas with exposed sedimentary or volcanic outcrops.