sedimentary

Green Jasper

Microcrystalline Quartz (Chalcedony), SiO2

AI-generated identification · may be incorrect

Hardness: 6.5 to 7 on the Mohs scale. Color: Muted green, sometimes with banding or inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (exhibits conchoidal fracture). Specific gravity: 2.58 to 2.91.

Hardness: 6
Color: Muted green, sometimes with banding or inclusions
Luster: Vitreous to waxy

Identified August 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through the precipitation of silica from aqueous solutions, often within silica-rich ash beds or marine sediments, or as a secondary filling in rock fractures. Geological age varies widely depending on the deposit location, spanning from Precambrian to Cenozoic eras.

Uses & applications

Used extensively for ornamental carvings, cabochons in jewelry, spheres, and as a popular specimen for mineral collectors.

Geological facts

Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and decorative ornaments. Green jasper, in particular, was historically prized by the ancient Egyptians and Romans for amulets and signet rings.

Field identification & locations

Easily identified in the field by its conchoidal fracture, waxy luster, opaque nature, and distinct hardness that easily scratches glass. Commonly found in riverbeds, hydrothermal veins, and sedimentary rock formations globally.