sedimentary

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs). Color: Opaque brown, ochre, and tan with subtle banding. Luster: Vitreous to dull. Structure: Microcrystalline quartz. Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Opaque brown, ochre, and tan with subtle banding
Luster: Vitreous to dull

Identified June 20, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs). Color: Opaque brown, ochre, and tan with subtle banding. Luster: Vitreous to dull. Structure: Microcrystalline quartz. Cleavage: None (conchoidal fracture).

Formation & geological history

Formed from fine-grained silica-rich sediments or volcanic ash that undergo lithification. It often occurs in association with iron oxides which provide the brown and yellow pigmentation. Most specimens range from several million to hundreds of millions of years in age.

Uses & applications

Used primarily in lapidary arts for decorative stones, cabochons, beads, and as an ornamental landscaping stone. Historically used for making tools due to its conchoidal fracture.

Geological facts

Jasper has been used as a gemstone for thousands of years and is mentioned in the Bible as being one of the stones on the High Priest's breastplate. The name is derived from the Greek 'iaspis', meaning spotted stone.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife) and its smooth, waxy feel. It is commonly found in riverbeds or desert regions. Collectors should look for unique banding patterns or 'picture' qualities.