sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs, Color: Olive to forest green, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.6-2.9

Hardness: 6

Identified June 24, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs, Color: Olive to forest green, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.6-2.9

Formation & geological history

Formed primarily from the precipitation of silica from groundwater in volcanic or sedimentary environments. Impurities like iron silicates or chlorite provide the green pigmentation. These often appear as river-tumbled stones in alluvial deposits.

Uses & applications

Used in lapidary arts for cabochons, beads, and carvings; historically used for tools due to conchoidal fracturing; popular as a pocket stone or for decorative landscaping.

Geological facts

Jasper is a variety of chalcedony. In ancient times, green jasper was often referred to as 'the rain bringer' and was considered a powerful stone of protection. It is opaque, distinguishing it from translucent green chalcedony or chrysoprase.

Field identification & locations

Identify in the field by its opacity, hardness (will scratch glass), and smooth, waxy texture when wet. Commonly found in riverbeds, beaches, and volcanic regions.