mineral

Yellow Jasper

Chalcedony (SiO2) with iron oxide inclusions

Hardness: 6.5-7 on Mohs scale; Color: Opaque mustard yellow to brownish-orange; Luster: Waxy to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Opaque mustard yellow to brownish-orange
Luster: Waxy to dull

Identified March 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water into cracks or cavities in volcanic or sedimentary rocks. The yellow coloration is caused by the presence of goethite or limonite (iron oxides). Specimens can range from thousands to millions of years old based on the host rock's geological age.

Uses & applications

Commonly used for lapidary work (cabochons and beads), decorative ornaments, metaphysical 'healing' stones, and as an industrial abrasive in some contexts.

Geological facts

Jasper is an impure variety of silica. The name 'Jasper' originates from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was often associated with solar energy and was used by desert travelers as an amulet of protection.

Field identification & locations

Identify in the field by its opacity (it should not let light through, unlike translucent Citrine), smooth waxy feel when wet or polished, and inability to be scratched by a steel knife. Frequently found in riverbeds, desert washes, and gravel pits globally, especially in Oregon (USA), Brazil, and South Africa.

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