mineral
Polished turquoise-like stone
Likely turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; identification is uncertain from the photo
AI-generated identification · may be incorrectBlue-green to pale green, waxy to dull luster, massive rather than visibly crystalline, Mohs hardness about 5–6, and specific gravity about 2.6–2.9; the rounded surface appears polished or naturally smoothed.
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Physical properties
Blue-green to pale green, waxy to dull luster, massive rather than visibly crystalline, Mohs hardness about 5–6, and specific gravity about 2.6–2.9; the rounded surface appears polished or naturally smoothed.
Formation & geological history
Turquoise forms as a secondary mineral in arid, oxidized copper deposits, commonly replacing host rock along fractures. Most deposits are Cenozoic to older, with age varying by locality.
Uses & applications
Used as a cabochon, bead, carving material, and collector specimen; lower-grade material is also stabilized, dyed, or reconstituted for jewelry.
Geological facts
Natural turquoise commonly contains brown or black limonite/matrix veining, while pale green color can reflect iron substitution or weathering. Similar-looking materials include chrysocolla, variscite, amazonite, and dyed magnesite.
Field identification & locations
Check for a nonmetallic waxy luster, moderate hardness, opaque blue-green color, and copper-associated matrix; a gemological test or spectroscopy is needed for confirmation. Common sources include Iran, Arizona, Nevada, China, Chile, and Mexico.
