sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2 with iron inclusions)

Hardness: 6.5-7 (Mohs); Color: Yellowish-brown to mustard; Luster: Vitreous to waxy; Structure: Microcrystalline (Cryptocrystalline quartz); Cleavage: None, Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellowish-brown to mustard
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into sedimentary or volcanic rock beds, often occurring near hydrothermal vents. The yellow coloration is due to the presence of goethite or limonite (iron oxides).

Uses & applications

Used primarily as a gemstone for jewelry, lapidary work (cabochons), and as a decorative or ornamental stone. It is also highly popular in the metaphysical and crystal collecting communities.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and was worn by shamans and kings. The name comes from the Greek 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify by its opacity (even when held to light), high hardness (cannot be scratched by steel), and smooth, water-worn texture if found in riverbeds. Common in Western USA, India, Russia, and Madagascar.

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