mineral

Tumbled pale green chalcedony (likely chrysoprase or serpentine)

Chalcedony: microcrystalline SiO₂; possible chrysoprase variety, colored by nickel

AI-generated identification · may be incorrect

Smoothly polished, pale mint-green, translucent to opaque, with a waxy luster and no visible cleavage; hardness about 6.5–7 Mohs, specific gravity 2.55–2.65. The photograph alone cannot reliably distinguish chrysoprase from serpentine or dyed quartz.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; chrysoprase’s green color develops from nickel-bearing impurities. Deposits range from ancient volcanic terrains to younger hydrothermal systems.

Uses & applications

Used as a lapidary stone, beads, cabochons, carvings, and inexpensive jewelry; attractive specimens are collected for color and translucency.

Geological facts

Chrysoprase is the most valuable green chalcedony and may fade with prolonged heat or sunlight. Serpentine is softer (about 2.5–5 Mohs) and commonly has a more mottled appearance.

Field identification & locations

Check for uniform color, waxy luster, and hardness; quartz should resist scratching by a steel blade, while serpentine usually scratches more easily. Common sources include Australia, Brazil, Poland, and the United States.