sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow, sandy gold, or brownish-yellow. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline). Cleavage: None. Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Mustard yellow, sandy gold, or brownish-yellow
Luster: Vitreous to waxy

Identified June 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from solution, typically in hydrothermal veins or as nodules in sedimentary rocks. The yellow coloration is due to the presence of iron oxide (goethite) inclusions.

Uses & applications

Primarily used for lapidary items, jewelry (cabochons), interior decoration, and as a popular semi-precious stone for collectors and metaphysical users.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since ancient times for talismans and seals; Egyptians associated yellow jasper with the sun and used it in protective amulets.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), conchoidal fracture pattern, and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and gravel deposits worldwide.