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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Biddle, Paul |
Bildgröße: | 5315 px × 5315 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |