sedimentary

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Reddish-brown, tan, and cream with translucent quartz zones; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture)

Hardness: 6
Color: Reddish-brown, tan, and cream with translucent quartz zones
Luster: Dull to Vitreous

Identified March 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds, typically over millions of years during the Phanerozoic Eon. The brown hues indicate the presence of iron oxides.

Uses & applications

Used primarily for lapidary work (cabochons), jewelry, ornamental carvings, and as a popular specimen for amateur rock collectors.

Geological facts

Jasper has been used by ancient civilizations for making tools and seals. It is a variety of chalcedony that is opaque due to its high mineral impurity content.

Field identification & locations

Identify in the field by its waxy-to-dull luster, hardness (will scratch glass), and opaque nature compared to transparent quartz. Found globally in riverbeds and mountainous terrain.