sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to dull; Crystal Structure: Hexagonal (trigonal microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow to brownish-yellow
Luster: Vitreous to dull

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to dull; Crystal Structure: Hexagonal (trigonal microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich groundwater and fluids that precipitate at low temperatures in fissures or volcanic ash, often associated with sedimentary and metamorphic processes. Most specimens are millions of years old.

Uses & applications

Primarily used in jewelry (beads, cabochons), lapidary art, and as decorative pocket stones or for metaphysical uses.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow coloring is usually caused by the presence of goethite or limonite (iron) inclusions within the quartz matrix.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a knife), smooth conchoidal fracture, and absolute opacity. Commonly found in riverbeds and deposits in Oregon (USA), Brazil, and Africa.