Smoky quartz crystals. Quartz (silicon dioxide) is colourless when pure,but impurities can impart a range of colours. It is thought the smoky colour arises from exposure to natural radioactivity | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Winters, Charles D. |
Taille de l’image : | 2514 px × 2550 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|