sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Hardness: 6.5-7 on Mohs scale; Color: Dull to dark green; Luster: Vitreous to waxy; Structure: Microcrystalline quartz (hexagonal system); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Dull to dark green
Luster: Vitreous to waxy

Identified May 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Over millions of years, the silica crystallizes into a dense, opaque microcrystalline quartz. The green color is often due to chlorite or other silicate mineral inclusions.

Uses & applications

Commonly used for lapidary work, decorative carvings, cabochons for jewelry, and as a popular tumbling stone for collectors.

Geological facts

Green jasper was highly prized in the ancient world; it was known as the 'rain bringer' in some cultures. It is often found as rounded river pebbles or in large nodules within sedimentary rock layers.

Field identification & locations

Identify by its smooth, waxy texture when wet/polished, high hardness (cannot be scratched by a steel knife), and dense opacity. Found frequently in riverbeds and coastal areas worldwide, particularly in the western United States, India, and Brazil.

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