sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, tan, or ochre; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow, tan, or ochre
Luster: Dull to vitreous

Identified July 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary environments. The yellow color is primarily due to the presence of goethite or other iron hydroxide minerals throughout the quartz matrix.

Uses & applications

Commonly used for lapidary work including cabochons, beads, and carvings. In metaphysical circles, it is used as a grounding stone. Historically used for making stone tools due to its conchoidal fracture.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' is derived from the Greek for 'spotted stone.' Large deposits are found in South Africa, Brazil, and the United States (Oregon and Idaho).

Field identification & locations

Identify in the field by its opacity (even on thin edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. It is often found as water-worn pebbles in riverbeds or as nodules in volcanic rock.

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Brecciated Chert (Microcrystalline Silica)

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