sedimentary

Red Jasper

Silicon Dioxide (SiO₂)

Hardness: 6.5-7 Mohs; Color: Brick red to deep brownish-red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Trigonal) microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep brownish-red
Luster: Vitreous to dull

Identified March 25, 2026More sedimentary →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in sedimentary or low-grade metamorphic environments. Its red color is derived from iron (hematite) inclusions within the cryptocrystalline quartz structure.

Uses & applications

Used primarily in lapidary arts for jewelry, decorative carvings, and cabochons. Historically used for making stone tools and seals. Also popular in metaphysical and crystal collecting markets.

Geological facts

Jasper has been a precious stone since ancient times; it is mentioned in the Bible and was highly valued by the Egyptians and Cretans. The term 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone.

Field identification & locations

Identify by its opaque nature (unlike translucent carnelian), its high hardness (it will scratch glass), and its smooth, waxy surface when polished. Commonly found in riverbeds or desert regions globally, particularly in India, Brazil, and the USA.