sedimentary

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Hardness: 6.5-7 (Mohs scale); Color: Pale to deep olive green; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Pale to deep olive green
Luster: Vitreous to waxy

Identified March 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when silica-rich fluids permeate through volcanic ash or sedimentary beds, slowly precipitating microcrystalline quartz. Usually associated with hydrothermal activity and can date from several million to hundreds of millions of years old.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons and beads), decorative carvings, and as a popular specimen for rock tumbling and crystal healing collections.

Geological facts

Jasper has been used as a gemstone since antiquity and is mentioned in various historical texts including the Bible. Green jasper was particularly prized in the ancient world for its supposed 'magical' cooling properties.

Field identification & locations

Identify in the field by its opacity (it does not transmit light like chalcedony), its high hardness (it will scratch glass), and its smooth, waxy feel. Found commonly in riverbeds and coastal areas of the Pacific Northwest (USA), India, and Brazil.

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