Ruby crystal and gems. Rubies are the red variety of the mineral corundum,which is itself a crystalline form of aluminium oxide with traces of iron,titanium and chromium. The red colour of a ruby is caused mainly by the presence of chromium | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Natural History Museum, London |
Bildgröße: | 4671 px × 3742 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |