sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs); Color: Deep forest green with occasional light speckling; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Deep forest green with occasional light speckling
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich volcanic ash or fine sediment in water, subsequently hardened under pressure. It is often found in prehistoric volcanic environments.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and tumbled stones. Historically used for seals, amulets, and ornamental carvings.

Geological facts

Jasper was a favorite gem in the ancient world; green jasper was particularly favored alongside lapis lazuli in Mesopotamian civilizations. It is a variety of chalcedony.

Field identification & locations

Identify in the field by its opacity (unlike translucent chrysoprase), its smooth waxy feel when polished, and its inability to be scratched by a steel knife. Common in riverbeds and mountainous regions of India, Russia, and the USA.

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