| It grades into a manganese-rich ilmenite that ultimately replaces the spinel phase near the transition to the garnet amphibolite. |
| Some garnets, e.g., Arizona ruby, Bohemian ruby, Cape ruby, and some spinels, e.g., balas ruby, ruby spinel, are ruby colored. |
| Even the famous Black Prince Ruby in the British Imperial State Crown is actually a spinel, not a ruby. |
| The Herbeira websterites contain diopside, enstatite, and pargasite with olivine, garnet, spinel, magnetite and ilmenite as minor phases. |
| Some of the characteristic minerals found in kimberlite are perovskite, magnetite, and spinel. |
| The boom has also boosted semi-precious stones, such as rubellite and red spinel, worn by those who can't quite stretch to a ruby. |
