mineral
Natural turquoise-bearing rock
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a limonite or host-rock matrix
AI-generated identification · may be incorrectBlue-green to green opaque patches in a brown, earthy matrix; waxy to dull luster, microcrystalline/triclinic structure, no visible cleavage, Mohs hardness about 5–6, and specific gravity roughly 2.6–2.8. The specimen appears rough and matrix-rich rather than gem-grade.
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Physical properties
Blue-green to green opaque patches in a brown, earthy matrix; waxy to dull luster, microcrystalline/triclinic structure, no visible cleavage, Mohs hardness about 5–6, and specific gravity roughly 2.6–2.8. The specimen appears rough and matrix-rich rather than gem-grade.
Formation & geological history
Turquoise forms when copper-rich groundwater alters aluminum- and phosphorus-bearing rocks, typically in arid climates; deposits are generally Cenozoic to older, depending on locality. The brown matrix may be limonite, iron-rich rock, or weathered host material.
Uses & applications
Used as a cabochon, bead, carving material, and collectible mineral; lower-grade matrix material is used in inexpensive jewelry and ornamentation. It has little construction or industrial use.
Geological facts
Turquoise’s color varies with copper, iron, and water content: copper favors blue, while iron commonly produces greener tones. The image alone cannot establish a specific mine or authenticate treatment.
Field identification & locations
Identify by its opaque blue-green color, relatively soft feel, earthy matrix, and lack of glassy transparency; avoid acids and prolonged soaking. Common sources include Arizona, Nevada, New Mexico, Iran, China, and Mexico.
