Ruby. Uncut natural ruby specimen. Ruby is a variety of corundum (aluminum oxide, Al2O3) whose red color is due to trivalent chromium (Cr3+) impurities. Corundum is defined to have hardness of 9 in the Mohs scale. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Turtle Rock Scientific |
Bildgröße: | 5161 px × 3439 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |