Turquoise / Nishapur / Large pendant / cabochon / new- 8.9 g - (1)

Nishapur turquoise pendant / cabochon / new

Set in 925 sterling silver

Including leather strap

Weight: 44.5 ct / 8.90 g (measured without leather strap)

24.1 mm x 18.6 mm x 9.4 mm

Brand new and unworn


Turquoise is a rare, water-containing copper-aluminium phosphate from the mineral class of 'phosphates, arsenates, and vanadates,' with the chemical composition CuAl6(PO4)4(OH)8·4H2O. Instead of aluminium, iron can also be incorporated into the crystal structure as Fe3+ (diadochy), which is why the chemical formula is often also given as Cu(Al,Fe)6(PO4)4(OH)8·4H2O.

Turquoise crystallizes in the triclinic crystal system and is the namesake of a group of minerals with the same structure but different compositions, known as the turquoise group, which includes Faustite, Chalkosiderite, Aheylite, and Planerite.

In nature, turquoise typically forms in grape-like or earthy-massive mineral aggregates. Crystals visible to the naked eye are very rare and are usually only a few millimeters in size with a prismatic to needle-like habit. The characteristic blue-green color of turquoise gives it its name.

Turquoise is used exclusively for jewelry stones.


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