Crystals of amethyst,a violet-hued variety of 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,violet and smoky brown. This specimen measures 6 x 5.5 cm and was found in Irai,Rio Grande do Sul,Brazil | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / De Gugliemo, Roberto |
Taille de l’image : | 3791 px × 4707 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |