Crystals of smoky quartz. Quartz (silicon oxide) is colourless when pure,but the presence of impurities can give a range of colours including white,pink,yellow,blue,green and smoky brown. This specimen measures 18 x 14 cm and was found in Pedra Alta's Mine,Sao Geraldo do Baixio,Brazil | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / De Gugliemo, Roberto |
Taille de l’image : | 3785 px × 4646 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |