Polished turquoise cabochon. The mineral turquoise is a hydrated copper-aluminium phosphate,formed by precipitation from aqueous solutions in a host rock rich in copper and aluminium. It is amorphous (non- or crypto-crystalline) and has a very characteristic blue-green colour. This rare gemstone has been highly valued since ancient times,being used in religious and artistic crafts. This shaped and polished turquoise stone is known as a cabochon | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 5219 px × 3425 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |