mineral

Yellow Jasper

Silicon dioxide with iron inclusions (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, tan, golden brown; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Mustard yellow, tan, golden brown
Luster: Dull to vitreous (waxy when polished)

Identified June 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its yellow color is derived from iron (goethite) inclusions. Much of the world's jasper is millions of years old, often found in hydrothermal veins or as river-worn nodules.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and ornamental carvings. It is also used as a decorative stone in landscaping and widely collected by rockhounds for its patterns.

Geological facts

Yellow Jasper has been used by ancient civilizations for amulets and carvings. It is famous for its 'picture' varieties where inclusions create scenes resembling landscapes. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opacity (will not let light through even at the edges), smooth water-worn texture on beaches/riverbeds, and its inability to be scratched by a steel knife. Common in the Pacific Northwest, Brazil, and South Africa.