sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, tan, golden brown with dark swirls; Luster: Dull to vitreous/waxy; Crystal Structure: Trigonal (Microcrystalline quartz); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow, tan, golden brown with dark swirls
Luster: Dull to vitreous/waxy

Identified April 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via the deposition of silica from water-rich environments, often in volcanic or sedimentary beds where iron impurities like goethite create the yellow banding. It is a microcrystalline variety of quartz.

Uses & applications

Commonly used for lapidary work, cabochons, metaphysical practices, home decor, and historically for stone tools and carvings.

Geological facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Arabic, Persian, Greek, and Latin. Yellow jasper is often called a 'nurturing stone' in folklore.

Field identification & locations

Identify by its opaque nature (unlike agate), conchoidal fracture patterns, and its inability to be scratched by a steel knife. Frequently found in riverbeds and coastal regions globally, particularly in areas with volcanic history.

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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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