sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Waxy to vitreous

Identified March 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, followed by compaction and silicification. Often found in Precambrian to Cretaceous deposits where iron oxide pigments are present during formation.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and decorative carvings. Also popular in metaphysical collections and as an ornamental stone in landscaping.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper specifically gets its color from iron-based impurities like goethite.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges, unlike agate), smooth water-worn texture, and high hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and on beaches.

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