sedimentary

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Hardness: 6.5-7 on the Mohs scale; Color: olive green to deep forest green with dark veining; Luster: waxy to vitreous when wet; Crystal structure: microcrystalline/cryptocrystalline aggregate; Cleavage: none, conchoidal fracture

Hardness: 6
Color: olive green to deep forest green with dark veining
Luster: waxy to vitreous when wet

Identified July 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or sedimentary processes, where iron silicates (like chlorite or actinolite) impart the green coloration. Common in oceanic crust subduction zone mélanges and beach pebble deposits.

Uses & applications

Used widely for lapidary work, cabochons, carved ornaments, tumbled stones, decorative accents, and jewelry making.

Geological facts

Green jasper was highly prized in ancient times and was mentioned in historical texts as a powerful protective stone. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identified in the field by its characteristic smooth, waxy feel when worn by water, distinct conchoidal fracture, hardness (scratches glass), opaque nature, and dull to waxy luster. Commonly found along beaches and riverbeds in coastal regions, particularly in California and Oregon.

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