sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on Mohs scale; Color: Opaque brick red to deep orange-red often with white or grey quartz veins; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58 - 2.91

Hardness: 6
Luster: Vitreous to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich groundwater into sedimentary or igneous rock cavities. The red color is caused by the inclusion of iron oxide (hematite). It can be found in formations dating back millions of years, often in volcanic ash beds.

Uses & applications

Commonly used in lapidary for jewelry (cabochons, beads), decorative carvings, aquarium gravel, and collected as a 'healing crystal' or metaphysical stone. Historically used for making cylinder seals and ornaments.

Geological facts

Jasper has been a favorite gemstone of the ancient world; it is mentioned in Biblical texts and was used in ancient Mesopotamia to make seals. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify in the field by its deep red color, opacity (light will not pass through it), and its ability to scratch glass but not be scratched by a steel pocket knife. Found globally, with notable deposits in India, Brazil, Madagascar, and the Southwestern USA.