sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, mustard, or tan
Luster: Vitreous to waxy

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica-rich volcanic ash or sediments where iron oxides are present to provide the yellow pigment. It typically occurs in hydrothermal veins or as nodules in sedimentary rocks.

Uses & applications

Used primarily in jewelry as cabochons or beads, for decorative carvings, as pocket stones for crystal healing, and as tumbled stones for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of protection and was often used in amulets by ancient civilizations.

Field identification & locations

Identify in the field by its opacity (unlike translucent citrine), conchoidal fracture, and smoothness after water erosion. Often found in riverbeds or coastal areas in the Western United States, Brazil, and Africa.