mineral

Green Chalcedony (likely Chrysoprase or dyed Green Agate)

Silicon Dioxide (SiO2) with nickel impurities or chromium/dye

Hardness: 6.5-7 (Mohs scale), Color: Vivid green to apple-green, Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None/Conchoidal fracture, SG: 2.6-2.65.

Hardness: 6

Identified February 21, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Vivid green to apple-green, Luster: Vitreous to waxy, Crystal structure: Trigonal (microcrystalline quartz), Cleavage: None/Conchoidal fracture, SG: 2.6-2.65.

Formation & geological history

Formed in hydrothermal environments or via weathering of ultrabasic rocks like serpentinites; deposits can range from ancient to relatively recent geological timeframes.

Uses & applications

Primarily used in jewelry as cabochons (as seen in the ring), beads, and ornamental carvings; also popular among crystal collectors.

Geological facts

Natural green chalcedony colored by nickel is called Chrysoprase and was famously favored by Frederick the Great of Prussia. Many modern commercial green cabochons are dyed agate which is more uniform in color.

Field identification & locations

Identify by its waxy luster, lack of visible crystals, and hardness. Commonly found in Australia, Brazil, Russia, and the USA. Collectors look for translucent specimens with even saturation.

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