sedimentary

Jasper (Red/Green Brecciated)

Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Mottled red, brown, and dull green; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Color: Mottled red, brown, and dull green
Luster: Vitreous to waxy

Identified February 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Mottled red, brown, and dull green; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Formation & geological history

Formed through the deposition of silica-rich fluids in cracks or volcanic cavities. Brecciated Jasper specifically forms when the original stone is fractured and then cemented back together by silica or hematite over millions of years.

Uses & applications

Used in the lapidary arts for cabochons, beads, and decorative carvings. It is also common as a landscape stone or a tumble-polished collector's item.

Geological facts

Jasper has been used since ancient times for amulets and tools; the name is derived from the Greek 'iaspis', meaning 'spotted stone.' It is a member of the chalcedony family.

Field identification & locations

Identify in the field by its high hardness (it cannot be scratched by a steel knife) and its smooth, waxy surface when wet. Commonly found in riverbeds, glacial tills, and desert pavements globally.