sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown with reddish or dark inclusions; Luster: Dull to Vitreous/Waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Luster: Dull to Vitreous/Waxy

Identified February 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from mineral-rich waters in sedimentary or volcanic environments. The yellow color is primarily due to the presence of goethite or iron hydrides. These rocks can range from hundreds of millions to billions of years old.

Uses & applications

Used primarily as decorative gemstones, in jewelry (cabochons, beads), and for lapidary carving. High-quality specimens are popular for metaphysical collecting.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, yellow jasper was known as a stone of protection and was often used in ancient civilizations for talismans and seal stones. It is mentioned in the Bible as one of the stones in the breastplate of the high priest.

Field identification & locations

Identify in the field by its opacity (even when held to light), conchoidal fracture, and extreme hardness (will scratch glass). Commonly found in riverbeds or desert regions in areas like India, Russia, Brazil, and the Southwestern US.

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