sedimentary

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on the Mohs scale. Color: Opaque tan/white with dark matrix. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.6 - 2.9.

Hardness: 6
Color: Opaque tan/white with dark matrix
Luster: Waxy to vitreous

Identified February 21, 2026More sedimentary →

Explore Jasper with Quartz inclusion in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5 - 7 on the Mohs scale. Color: Opaque tan/white with dark matrix. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.6 - 2.9.

Formation & geological history

Formed from silica-rich fluids percolating through sedimentary rocks or volcanic ash, often during the Proterozoic to Cenozoic eras. The central feature suggests a geode-like cavity filling where quartz crystals precipitated late in the stone's formation.

Uses & applications

Commonly used for lapidary work (cabochons), river rock landscaping, aquarium decor, and as 'pocket stones' for collectors. Hard enough for tumbling and polishing to a high gloss.

Geological facts

Jasper is an impure variety of silica; the different colors are caused by mineral inclusions like iron oxide. The term comes from the Greek 'iaspis', meaning 'spotted stone.' Many tumbled river jaspers show unique 'bullseye' or 'eye' patterns like the specimen pictured.

Field identification & locations

Identify in the field by its smoothness (water-worn), hardness (it will scratch glass), and opacity. Common in riverbeds and coastal regions worldwide, especially in the Western United States and India.