Tourmaline crystals in quartz. Close-up of tourmaline crystals (green) embedded in quartz (silicon dioxide,clear). Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline are highly prized gemstones. This sample measures 55 millimetres across | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wiersma, Dirk |
Bildgröße: | 4820 px × 3721 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |