sedimentary

Jasper

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Reddish-brown with light quartz veining; Luster: Dull to waxy when raw, vitreous when wet or polished; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Reddish-brown with light quartz veining
Luster: Dull to waxy when raw, vitreous when wet or polished

Identified June 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water-rich environments, often in volcanic ash or sedimentary layers. The red-brown color is typically due to iron inclusions.

Uses & applications

Used primarily for ornamental purposes, jewelry (lapidary), spiritual practices, and as landscaping stones or collectable river stones.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since ancient times for cylinder seals and amulets. It is often called the 'supreme nurturer' in metaphysical circles.

Field identification & locations

Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, water-worn texture if found in riverbeds. Common in rocky outcrops and riverbanks globally.