sedimentary

Yellow Jasper

Jasper (SiO2) with iron hydroxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellow to brownish-yellow
Luster: Vitreous to waxy

Identified February 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water solutions into cracks or cavities in other rocks. The yellow color is caused by the presence of Goethite or other iron hydroxide inclusions. Often found as water-worn pebbles in stream beds.

Uses & applications

Polished for use in jewelry (cabochons), carved into ornaments, and used in lithotherapy or crystal collecting.

Geological facts

Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used in the seals of ancient civilizations. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its opacity, hardness (cannot be scratched by a steel knife), and smooth, rounded water-worn shape. Commonly found in riverbeds, beaches, and desert areas worldwide.