gemstone

Likely chrysoprase (green chalcedony)

Chrysoprase, a nickel-bearing variety of microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

The small, rounded specimen shows pale apple-green to yellow-green material with a reddish-brown rind or matrix. Quartz has Mohs hardness 6.5–7, vitreous to waxy luster, and no cleavage; the image alone cannot confirm the identification.

Identified October 11, 2026More gemstone →

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Physical properties

Formation & geological history

Chrysoprase forms when nickel-bearing fluids alter ultramafic rocks, depositing silica in fractures and weathered zones. It is commonly associated with lateritic deposits; a precise age cannot be determined from the photo.

Uses & applications

Used for beads, cabochons, ornamental objects, and mineral collecting; attractive, evenly colored pieces are most desirable.

Geological facts

Its green color comes chiefly from trace nickel, unlike emerald’s chromium or vanadium coloration.

Field identification & locations

Look for apple-green color, waxy luster, and translucence at thin edges; confirm with hardness and mineral testing, since other green stones can look similar. Notable sources include Australia, Brazil, and parts of Central Europe.