mineral

Yellow Jasper

Chalcedony (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale), Color: Yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified February 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed via the deposition of silica from water-rich solutions into volcanic or sedimentary cavities; the yellow color is typically due to Goethite or other iron hydroxide inclusions.

Uses & applications

Commonly used for lapidary work, cabochons, beads, decorative carvings, and as a collector's stone.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it has been used for seals and amulets, and it is known for its smooth, river-tumbled appearance in alluvial deposits.

Field identification & locations

Identifiable by its smooth waxy surface, lack of transparency (opaque), and resistance to scratching from steel. Often found in riverbeds and coastal regions.

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