Rare group of tubular, hexagonal quartz crystals, their surface covered by a finely crystalline coating. From a cavity in igneous rock near Sao Gabriel, Rio Grande do Sul, Brazil. Full width of specimen is 230 mm. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 5616 px × 3744 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |