sedimentary

Yellow Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91

Hardness: 6
Color: Mustard yellow, golden brown
Luster: Vitreous to waxy

Identified April 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91

Formation & geological history

Formed from the deposition of silica from water solutions into cavities or as replacement minerals in sedimentary or volcanic environments. The yellow color is primarily due to goethite or other iron hydroxide inclusions.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also popular in holistic practices and as a collector's specimen.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone'. In ancient times, it was considered a 'rain bringer' and a stone of protection for travelers.

Field identification & locations

Identify in the field by its opacity (unlike transcluent agate), smooth conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in river beds or areas with volcanic activity.