sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9

Hardness: 6

Identified July 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water-saturated volcanic ash or sedimentary beds. Its yellow color is derived from high concentrations of goethite or limonite (iron oxides). Often found as river-worn pebbles.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and tumbled stones. Historically used for making tools and seals. Also popular in metaphysical collections.

Geological facts

Jasper is an opaque variety of chalcedony. Yellow jasper was traditionally used as a protective stone by indigenous cultures and is frequently associated with the 'solar plexus' in spiritual practices.

Field identification & locations

Identify in the field by its opacity (it will not let light through even at thin edges, unlike agate), its smooth waxy feel when wet, and its inability to be scratched by a steel knife. Commonly found in river beds and gravel deposits worldwide.

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Sandstone or Siltstone

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

Argillaceous sedimentary rock

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Sandstone

Arenite (primarily SiO2)

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