mineral

Polished chrysoprase (likely)

Chrysoprase, nickel-bearing chalcedony (microcrystalline SiO₂)

AI-generated identification · may be incorrect

Opaque to translucent apple-green/blue-green, polished waxy-to-vitreous luster, with brown matrix or fracture veining. Mohs hardness 6.5–7; trigonal silica, no visible cleavage. The photo alone cannot confirm the identification; similar green jasper or dyed chalcedony is possible.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids deposit chalcedony in weathered, nickel-bearing ultramafic rocks, commonly in veins and cavities. It is a secondary mineral formed during weathering, rather than a distinct igneous or metamorphic rock.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; attractive material is collected as a gemstone.

Geological facts

Its green color comes chiefly from trace nickel, distinguishing it from chromium-colored emerald and jade.

Field identification & locations

Look for even green color, translucent edges, and a waxy polish; hardness and appearance need testing to distinguish it from dyed stone. Notable sources include Australia, Poland, Brazil, and Tanzania.