Cut crystals of tanzanite,a blue variety of zoisite (hydrous calcium aluminium silicate) which contains impurities of chromium and strontium. Various shades of smokey-blue and vilolet-blue are seen here. Zoisite occurs in a variety of other colours including white,pale green and pink. Tanzanite is found only in Tanga province,Tanzania,and is considered an important gemstone | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Fleming, Vaughan |
Bildgröße: | 5055 px × 3458 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |