sedimentary

Red Jasper

Microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

AI-generated identification · may be incorrect

Hardness of 6.5-7 on Mohs scale; deep brick-red to terracotta color; vitreous to dull waxy luster (high polish here); trigonal/microcrystalline aggregate structure; no cleavage, conchoidal fracture; specific gravity around 2.58-2.91.

Identified October 3, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the precipitation of silica from volcanic hydrothermal solutions or silica-rich sedimentary waters percolating through rock fractures and voids, with hematite (iron oxide) inclusions providing the intense red coloration.

Uses & applications

Commonly carved and polished into decorative shapes such as eggs, spheres, and cabochons; extensively used in lapidary work, wire-wrapped jewelry, bead-making, and metaphysical collections.

Geological facts

Red jasper has been revered since antiquity; in ancient Egypt it was associated with the blood of Isis and carved into protective amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identifiable by its distinct opaque brick-red color, fine grain, high hardness (cannot be scratched by a steel nail), and subtle vein patterns. Widely sourced from India, Brazil, Madagascar, and the western United States.