gemstone

Green chalcedony (likely dyed or treated)

Chalcedony, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent vivid green, waxy-to-glassy luster, cryptocrystalline structure, no visible cleavage, conchoidal fracture. The uniformly bright color and polished/tumbled form suggest dyeing or treatment; other possibilities include chrysoprase or glass, but the image is insufficient for certainty.

Identified September 21, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits microcrystalline quartz in cavities and fractures, commonly in volcanic rocks. Deposits range from Precambrian to recent; green color in natural chrysoprase comes from nickel, while dyed material is artificially colored.

Uses & applications

Used for cabochons, beads, carvings, and decorative stone; chalcedony is also used in ornamental objects and historically as tool material.

Geological facts

Natural chrysoprase is the prized green chalcedony variety; agate, onyx, and jasper are related chalcedony varieties distinguished mainly by pattern, color, and opacity.

Field identification & locations

Common sources include Brazil, India, Madagascar, Australia, Turkey, and the United States. Test hardness against steel or glass, inspect for dye concentration in cracks, and use specific gravity or microscopy for confirmation.