Turquoise

Formula: CuAl₆[(OH)₂/PO₄]₄.4H₂O
Mineral class: phosphates
Crystal system: triclinic
Mohs scale: 5 - 6
Density (g/cm³): 2.6 - 2.8
Refractive index: 1.610 - 1.650
Colors: blue, blue-green, green
Fluorescence: slightly yellowish green, light blue
Pleochroism: slight
Largest Turquoise crystal: 3 mm?
Deposits: Iran, Afghanistan, Australia, China, Israel, Tanzania, USA
Name: from the old French term "turkoys", via "pierre turquoise" ("stone from Turkey"), because of the misunderstanding that the stones were originated from Turkey (origin: Iran)

Turquoise Mineral

Origin: China

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Turquoise

Weight: 9,73 ct

Origin: Arizona / USA

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Turquoise

Weight: 8.22 ct

Origin: USA

Photo by kind permission of © www.multicolour.com

Turquoise Necklace

Size: 1.0 - 1.5 cm
Length: 45.72 cm
Gold: 18K Yellow gold

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Turquoise

Size: 2.47 x 1.45 x 0.68 cm
Weight: 21.93 ct
Origin: Nishapur / Iran

Photo by kind permission of © www.wildfishgems.com

Turquoise

Size: 2.02 x 1.46 x 1.2 cm
Weight: 25.72 ct
Origin: Nishapur / Iran

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Turquoise

Weight: 25.80 ct

Origin: Tibet / China

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Turquoise Mineral

Size: 6.5 x 5.0 x 3.5 cm

Origin: Ameroo / Olary Prov. / South Australia / Australia

Photo by kind permission of © www.ckminerals.com.au

Turquoise

Size: 1.69 x 1.33 x 0.55 cm
Weight: 12.83 ct
Origin: Nishapur / Iran

Photo by kind permission of © www.wildfishgems.com

Turquoise

Weight: 52.38 ct

Origin: Nevada / USA

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Turquoise

Weight: 4.23 ct

Origin: Nishapur / Iran

Photo by kind permission of © www.wildfishgems.com

Turquoise

Weight: 47 ct

Origin: Hubei Prov. / China

Photo by kind permission of © www.color-wright.com