sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to pale yellow; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Color: Mustard yellow to pale yellow
Luster: Vitreous to waxy

Identified March 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine silica from volcanic ash or volcanic water in sedimentary environments. Over time, silica-rich fluids permeate porous rock, solidifying and staining with iron oxides to create its characteristic yellow hue.

Uses & applications

Primarily used for lapidary arts, jewelry (cabochons and beads), ornamental items, and as a popular palm stone for mineral collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' originates from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper has been used as a protective talisman throughout ancient history by various civilizations.

Field identification & locations

Identify in the field by its complete opacity (unlike translucent citrine), conchoidal fracture, and extreme hardness. It won't be scratched by a steel knife. Common locations include Brazil, India, Australia, and the USA.

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