mineral

Tumbled green chalcedony (likely chrysoprase)

Chalcedony, microcrystalline quartz (SiO₂); green color may be from nickel-bearing chrysoprase

AI-generated identification · may be incorrect

Opaque to translucent green with a polished, waxy-to-vitreous luster; quartz’s trigonal crystal structure is microscopic, with no visible cleavage. Mohs hardness 6.5–7; the image does not show diagnostic detail to confirm chrysoprase rather than another green chalcedony or dyed stone.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms as silica deposited in cavities and fractures, often at low temperatures; chrysoprase’s green hue commonly comes from nickel. Such deposits occur in varied geological settings and span a wide range of ages.

Uses & applications

Tumbled stones are used for jewelry, ornaments, and collecting; higher-quality chrysoprase is cut as a gemstone.

Geological facts

Chalcedony is a dense aggregate of microscopic quartz crystals, so individual crystals are not usually visible.

Field identification & locations

Look for a smooth, waxy surface and translucent, fairly even green color; natural chrysoprase may show subtle mottling. Common sources include Australia, Brazil, and Poland; color alone cannot establish identity.