mineral

Tumbled blue-green stone, likely chrysoprase or dyed agate

Chalcedony (microcrystalline SiO₂), possibly nickel-bearing chrysoprase

AI-generated identification · may be incorrect

Smooth tumbled surface; blue-green color, waxy to vitreous luster, no visible crystal faces, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is typically 2.55–2.65.

Identified August 24, 2026More mineral →

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Physical properties

Smooth tumbled surface; blue-green color, waxy to vitreous luster, no visible crystal faces, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is typically 2.55–2.65.

Formation & geological history

Chrysoprase forms when silica-rich groundwater deposits chalcedony colored by nickel minerals, commonly in weathered ultramafic rocks; agate forms in volcanic cavities. Precise age and identity require testing.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; common tumbled pieces have modest jewelry and collecting value.

Geological facts

Natural chrysoprase is usually apple-green rather than distinctly blue; blue-green color may indicate dyed chalcedony, treated material, or another copper-bearing stone.

Field identification & locations

Common sources include Australia, Brazil, Madagascar, Poland, and the United States. Check for dye concentration in cracks, uniform color, hardness, and translucency; a gemological test or spectroscopy is needed for confirmation.