sedimentary

Yellow Jasper

Chalcedony (SiO2)

Hardness: 6.5-7 (Mohs), Color: Yellow to brownish-yellow/ochre, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58–2.91

Hardness: 6

Identified July 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs), Color: Yellow to brownish-yellow/ochre, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the accumulation of fine silica-rich sediment or volcanic ash. The yellow color is typically caused by the inclusion of iron oxides like goethite or limonite. It is found in hydrothermal veins and sedimentary deposits.

Uses & applications

Primarily used for lapidary work including cabochons, beads, decorative carvings, and as a collector's stone. It is also historically used for ornate seals and amulets.

Geological facts

The name 'Jasper' originates from the Greek 'iaspis', meaning spotted stone. Ancient civilizations associated yellow jasper with the sun and used it as a protective stone for travelers.

Field identification & locations

Identify in the field by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. It is common in riverbeds and arid desert environments.