Rough Black Corundum
Small rough pieces of Black Corundum, a form of Aluminium Oxide famous for forming Rubies and Sapphires.
These pieces measure 10-20MM approximately and make a decent study specimen; they can also be used for gravel due to their low price and nice contrast with white stones like Quartz.
As quite a hard stone, these pieces may be suitable for rock tumbling. It is a good idea to try the lower priced black Corundum before tumbling even low grade Ruby or Sapphire, which are more expensive by far.
The pictures you see here are representative of the products and are usually not the exact item you will receive. Where various grades are available we do try to photograph each grade – but some photographs are still on their way!
For more information about Corundum, and a full list of all of our related products, have a look at our ‘Corundum’ page.