Turquoise

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Polished Turquoise Pebble - Madagascar - Polished Minerals 6.1 cm / 127g / BM914

Polished Turquoise Pebble - Madagascar - Polished Minerals 5.7 cm / 87g / BM917

Polished Turquoise Pebble - Madagascar - Polished Minerals 5.3 cm / 100g / BM916

Polished Turquoise Pebble - Madagascar - Polished Minerals 6.2 cm / 183g / BM913

Turquoise belongs to the phosphate group and contains copper, aluminum, and phosphorus. Its chemical formula is _CuAl6 ( _PO4 ) ₄ (OH) ₈ · _4H2O .

Turquoise typically occurs in a massive or microcrystalline form with minimal crystal development. It is a fragile gemstone, and its dehydration must be carefully monitored. Its hardness ranges from 5 to 6 on the Mohs scale (10 for diamond), and its density varies between 2.6 and 2.8 (1 for water). The streak on porcelain is white. Copper is responsible for its beautiful, nuanced color, ranging from blue to green. The name Turquoise comes from the name of Turkey.