mineral

Polished green agate/chalcedony

Microcrystalline quartz (SiO₂), likely chrysoprase- or moss-agate-like chalcedony

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent blue-green to gray-green with a waxy/glassy luster and no visible cleavage. Its rounded form is tumbled and polished, so crystal structure is cryptocrystalline rather than visibly crystalline.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater filled cavities or fractures in volcanic rock, where chalcedony precipitated in layers or patches. Such agates commonly formed during the Cenozoic or older volcanic episodes, depending on locality.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive jewelry; polished pieces are popular for collecting and metaphysical displays.

Geological facts

Green coloration may come from nickel-bearing chalcedony (chrysoprase) or inclusions of chlorite, celadonite, or other minerals. Natural color zoning and translucency help distinguish it from dyed glass or resin.

Field identification & locations

Check for translucency, subtle internal banding or inclusions, a waxy surface, and quartz-like hardness; it should resist scratching by steel but not by quartz. Common sources include Brazil, Uruguay, India, Madagascar, Australia, and the western United States.