sedimentary

Yellow Jasper

Chalcedony/Quartz (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.7.

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

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, or tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.7.

Formation & geological history

Formed via the accumulation of silica-rich fluids in low-temperature environments, often within volcanic ash or sedimentary beds. The yellow color is caused by the presence of iron (goethite or limonite) during formation.

Uses & applications

Commonly used for lapidary work, jewelry (beads, cabochons), carvings, and as a popular tumbled stone for collectors and metaphysical practices.

Geological facts

Jasper was a highly favored stone in the ancient world, mentioned in biblical texts and used for seals in Mesopotamia. Yellow jasper is specifically associated with protection and solar energy in folklore.

Field identification & locations

Identify by its smooth, waxy texture when polished, its opaque nature (unlike yellow agate which is translucent), and its high hardness which will scratch glass. Look for it in river beds and sedimentary deposits globally.