Tourmaline crystal specimens. Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline,such as these bi-coloured crystals,are highly prized gemstones | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 3670 px × 2381 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |