sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Structure: Hexagonal (trigonal) cryptocrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.63-2.65

Hardness: 6

Identified July 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine volcanic ash or silica-rich sediment that precipitates from mineral-rich fluids. It often occurs as nodules or fillings in fissures and is primarily linked to hydrothermal or sedimentary processes.

Uses & applications

Used widely for lapidary work, including cabochons, beads, and tumbled stones. Historically used for making stone tools due to its conchoidal fracture. Also popular in jewelry and as a meditation stone.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Yellow jasper specifically gets its color from iron inclusions such as goethite.

Field identification & locations

Can be identified by its opacity (unlike translucent agate), its smooth waxy surface when polished, and its inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments in the USA (Oregon, Idaho), Madagascar, and Russia.

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