sedimentary

Yellow Jasper

Jasper (variety of Quartz - SiO2)

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Dull to waxy; Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Dull to waxy

Identified June 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine volcanic ash or silica-rich sediments in geothermal or sedimentary environments. The yellow color is primarily caused by inclusions of goethite or iron hydroxides.

Uses & applications

Used primarily as decorative gemstones, lapidary art, beads for jewelry, and as ornamental stone for crafts. Historically used for making tools and seals.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for both its beauty and its perceived protective properties.

Field identification & locations

Identify by its opacity, conchoidal fracture (curved breaks), and ability to scratch glass. It is commonly found in riverbeds, mountains, and desert environments worldwide, notably in the USA (Oregon, Idaho), India, and Madagascar.