Quartz crystals. Quartz or silicon dioxide (SiO2),one of the commonest minerals in the Earth's crust (12% by volume). The pure,colourless variety is also known as rock crystal and is used as a gemstone and highly prized by collectors. When it contains impurities,these impart a range of colours including white,yellow,pink,blue,green and smoky brown | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Lawry, Lawrence |
Bildgröße: | 3418 px × 4119 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |