sedimentary

Yellow Jasper with Hematite

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow (due to goethite) with reddish-brown spot (hematite); Luster: Waxy to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Opaque.

Hardness: 6
Color: Yellow (due to goethite) with reddish-brown spot (hematite)
Luster: Waxy to dull

Identified June 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the precipitation of silica from volcanic ash or hydrothermal fluids in sedimentary environments. The rounded shape indicates extensive water erosion in a beach or river environment. Ages range widely from Precambrian to Cenozoic.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), river rock landscaping, and as a popular specimen for rock hounds and collectors.

Geological facts

Jasper is an impure variety of silica. The name comes from the Greek word 'iaspis', meaning spotted stone. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identify by its extreme hardness (cannot be scratched by a steel knife), waxy surface when wet, and lack of translucency compared to agate. Commonly found in gravel pits, riverbeds, and coastal beaches.