sedimentary

Jasper (Iron-stained Quartz)

Silicon dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow, orange, reddish-brown; Luster: Dull to waxy when unpolished; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None, conchoidal fracture

Hardness: 6
Color: Yellow, orange, reddish-brown
Luster: Dull to waxy when unpolished

Identified May 17, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow, orange, reddish-brown; Luster: Dull to waxy when unpolished; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None, conchoidal fracture

Formation & geological history

Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary deposits, heavily influenced by hydrothermal circulation. The yellow and orange hues are typically caused by goethite or limonite staining.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), river rock landscaping, and as a decorative collector stone due to its durability and color variety.

Geological facts

Jasper is a variety of chalcedony. It has been used since antiquity for seals and symbols of protection. Many cultures believed it could ward off evil spirits and enhance physical strength.

Field identification & locations

Identify in the field by its smooth, water-worn exterior, high hardness (will scratch glass), and opaque appearance. Commonly found along riverbeds, beaches, and desert regions globally.