Ruby gemstones. Rubies are a red variety of the mineral corundum (aluminium oxide). It is the second hardest mineral after diamond,rated 9 out of 10 on the Mohs scale. Artificial rubies are used in industrial lasers and also in analogue watch mechanisms. Inclusions of the mineral rutile (titanium oxide,not seen) cause a six- pointed-star light effect (asterism) to form star ruby | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Lawry, Lawrence |
Bildgröße: | 4470 px × 3145 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |