Corundum ranks 9 th on Moh's Hardness scale Color Examples of common dark-colored minerals (black, dark brown, dark green) are amphibole , olivine , pyroxene , biotite mica .
(Corundum; ranks; 9 th; L:on Moh's Hardness scale Color Examples of common dark-colored minerals) (black, dark brown, dark green; are; amphibole , olivine , pyroxene)
Corundum black, dark brown, dark green
ranks are
9 th L:on Moh's Hardness scale Color Examples of common dark-colored minerals
amphibole , olivine , pyroxene