A cut and polished crystal of imperial topaz. Topaz is a silicate of aluminium and fluorine and can occur in many colours including yellow,blue,green,violet,reddish-brown and colourless. Clear or finely-coloured varieties,such as that seen here,are used as gemstones | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Fleming, Vaughan |
Taille de l’image : | 3611 px × 2480 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |