On the Mohs hardness scale (talc being zero and diamond being 10), Aluminum Oxide is rated 9.
(talc; being; zero) (Aluminum Oxide; is rated; 9; L:On the Mohs hardness scale (talc being zero and diamond)
talc Aluminum Oxide
being is rated
zero
9 L:On the Mohs hardness scale (talc being zero and diamond