A 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 are used as gemstones. This specimen measures 10 x 4 cm and was found in Vermelhao's Mine,Ouro Preto,Brazil | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / De Gugliemo, Roberto |
Taille de l’image : | 3746 px × 4724 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |