sedimentary

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Variegated deep greens, teals, and reddish-browns; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Variegated deep greens, teals, and reddish-browns
Luster: Vitreous to waxy

Identified March 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water or volcanic ash. The distinctive colors are caused by mineral impurities, typically iron oxides, within the microcrystalline quartz structure. It often forms in hydrothermal environments or sedimentary beds.

Uses & applications

Commonly used in lapidary work for making cabochons, beads, and architectural ornaments. It is also a popular stone for collectors and metaphysical users due to its aesthetic patterns.

Geological facts

Jasper has been used by ancient civilizations for seal stones and amulets for thousands of years. This specific specimen exhibits a 'chert-like' conchoidal fracture which was historically prized for making stone tools.

Field identification & locations

Identify in the field by its smooth, shell-like fracture surfaces and the fact that it cannot be scratched by a steel knife. Frequently found in riverbeds, desert landscapes, and volcanic deposits in locations like Oregon, Idaho, and Madagascar.