mineral
Polished turquoise-colored stone, likely chrysoprase or dyed agate
Uncertain; possible chalcedony (microcrystalline SiO₂) or turquoise (hydrous copper aluminum phosphate)
AI-generated identification · may be incorrectOpaque blue-green, waxy to dull luster, with a roughly sawn and polished face; apparent hardness about Mohs 6–7 if chalcedony, or 5–6 if turquoise. The image alone cannot confirm composition, texture, or specific gravity.
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Physical properties
Opaque blue-green, waxy to dull luster, with a roughly sawn and polished face; apparent hardness about Mohs 6–7 if chalcedony, or 5–6 if turquoise. The image alone cannot confirm composition, texture, or specific gravity.
Formation & geological history
If chalcedony, it formed from silica-rich fluids filling cavities in volcanic rocks, commonly during the Cenozoic; if turquoise, it formed by secondary copper-phosphate alteration, often in arid climates. Geological age is indeterminate from the photograph.
Uses & applications
Used as a cabochon, carving material, ornamental stone, or lapidary rough; turquoise is valued in jewelry, while common dyed or low-grade material has modest decorative value.
Geological facts
The vivid, uniform cyan color and slab-like shape may indicate dyed chalcedony, reconstructed turquoise, or another treated lapidary material rather than natural gem-quality turquoise.
Field identification & locations
Check hardness, streak, translucency at thin edges, and reaction to acetone or solvents; avoid destructive tests on valuable material. Common possibilities occur in Brazil, Madagascar, Australia, the southwestern United States, and Iran.
