sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow to mustard brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow to mustard brown
Luster: Vitreous to waxy

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Yellow to mustard brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich groundwater percolating through sedimentary or volcanic rocks. The yellow color is primarily due to goethite or other iron hydroxide inclusions. It can form in various geological timeframes from Precambrian to recent.

Uses & applications

Used primarily for ornamental purposes, jewelry (cabochons, beads), decorative carvings, and lapidary art. It's also popular in the metaphysical/collecting community.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone.' Yellow Jasper was historically used by ancient civilizations as a stone of protection for travelers.

Field identification & locations

Identify by its opacity (unlike translucent citrine), conchoidal fracture when broken, and dull waxy surface when unpolished. Found globally with major deposits in India, Russia, Brazil, and the USA. It is often discovered as water-worn pebbles in riverbeds.