sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow, ochre, or earthy gold; Luster: Dull or waxy; Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Color: Mustard yellow, ochre, or earthy gold
Luster: Dull or waxy

Identified July 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its yellow color is derived from high concentrations of goethite or limonite (iron hydroxides) during deposition.

Uses & applications

Used primarily for ornamental purposes, jewelry (cabochons, beads), decorative carvings, and as a popular specimen for gem and mineral collectors due to its hardness and ability to take a high polish.

Geological facts

Jasper has been used since antiquity as a gemstone and for tool-making. Yellow jasper was traditionally used as a protective stone for travelers. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opacity (it will not let light through even at thin edges), smooth waxy feel when wet or worn, and mustard-yellow streak. Common in riverbeds and desert environments worldwide, notably in India, Russia, and the USA.

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Brecciated Chert (Microcrystalline Silica)

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