sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Waxy to vitreous, Crystal structure: Microcrystalline/Trigonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine-grained silica in hydrothermal veins or sedimentary environments. The yellow color is derived from high iron content (limonite or goethite). Often found as river-worn cobbles since the Cretaceous period.

Uses & applications

Used primarily as decorative gemstones, cabochons for jewelry, pocket stones for metaphysical purposes, and as an ornamental material in mosaic tiles or sculptures.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used in amulets and cylinders for thousands of years throughout ancient Egyptian and Mesopotamian cultures.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), its smooth river-worn texture, and its inability to be scratched by a steel knife. Commonly found in riverbeds, beaches, and desert washes worldwide.

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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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