Tourmaline. The specimen at bottom left is in its natural state,the other specimens have been polished. Tourmaline is a silicate mineral that can occur in several colours | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biddle, Paul |
Taille de l’image : | 5315 px × 5315 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |