sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Structure: Microcrystalline quartz (trigonal). Cleavage: None. Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Structure: Microcrystalline quartz (trigonal). Cleavage: None. Specific Gravity: 2.58-2.91.

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or in sedimentary environments where volcanic ash or fine sediment is petrified. Its color comes from high iron content.

Uses & applications

Used primarily in jewelry as cabochons or beads, for decorative carvings, as tumbled stones for collecting, and in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. Yellow jasper was historically used by travelers as a protective stone. It is often found as smooth river pebbles or in large veins.

Field identification & locations

Identify by its complete opacity (it does not let light through even at the edges), smooth waxy feel when polished, and characteristic ochre-yellow hue. Often found in South Africa, USA, and Madagascar.