sedimentary

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Red, reddish-brown, often variegated; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red, reddish-brown, often variegated
Luster: Vitreous to dull/waxy

Identified April 8, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Red, reddish-brown, often variegated; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from water-rich environments, often occurring in hydrothermal veins or as a chemical sedimentary deposit. Many jasper formations date back to the Precambrian era.

Uses & applications

Used primarily as an ornamental stone, for lapidary work (cabochons), jewelry, and as a collector's specimen. It was historically used for making tools and seals.

Geological facts

Jasper is a variety of chalcedony. The red coloration is typically caused by iron inclusions. It is known as the 'supreme nurturer' in metaphysical circles and has been used by various cultures for thousands of years.

Field identification & locations

Identify by its opaque quality (unlike agate which is translucent), its hardness (will scratch glass), and its characteristic smooth, conchoidal fracture. Often found in riverbeds, deserts, or near volcanic regions.