sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to dark ocher; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to dark ocher
Luster: Vitreous to waxy

Identified April 7, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to dark ocher; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine-grained silica particles in volcanic ash or sedimentary environments. Its yellow color is derived from iron silicate or goethite impurities trapped during crystallization.

Uses & applications

Commonly used for lapidary work, cabochons, beads, decorative carvings, and as a pocket stone for collection or metaphysical purposes.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' It has been used by ancient civilizations for seals and talismans for over 5,000 years.

Field identification & locations

Identify in the field by its opacity (will not let light through even at the edges), its smooth conchoidal fracture, and inability to be scratched by a steel pocketknife. Often found in riverbeds or coastal deposits.