Quartz. The specimen at bottom is in its natural state the other specimens have been polished. Quartz is a form of silica (silicon dioxide). It is colourless and transparent when pure | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Biddle, Paul |
Bildgröße: | 5175 px × 4131 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |