sedimentary (microcrystalline silicate)

Yellow Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on Mohs scale; Color: mustard yellow to pale tan; Luster: dull to vitreous; Crystal structure: trigonal/microcrystalline; Cleavage: none (conchoidal fracture); Specific gravity: 2.58 - 2.91

Hardness: 6
Color: mustard yellow to pale tan
Luster: dull to vitreous

Identified March 27, 2026More sedimentary (microcrystalline silicate) →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich groundwater into cracks and cavities within other rocks or from consolidated volcanic ash. The yellow color results from high concentrations of goethite or iron oxide (limonite) during the petrification process.

Uses & applications

Used primarily as decorative gemstones, lapidary cabochons, metaphysical 'healing' stones, and historically as durable material for tools like scrapers and arrowheads because of its hardness.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was considered a sacred stone by Native American cultures, often associated with protection and grounding.

Field identification & locations

Identify by its opacity (it does not transmit light even if thinly sliced), smooth waxy feel when polished, and pitted surface when found as a water-worn river pebble. Common in desert regions and riverbeds globally.