Rocks & Minerals with a Mohs Hardness of 9
On the Mohs scale, hardness 9 is defined by corundum. The 3 rocks and minerals below fall at or within the 9 to 10 band, so they scratch anything softer on this page and are scratched by anything harder.
Field test: It scratches glass, steel and even quartz; only harder gems will mark it.
Hardness is a range for many species, so an entry listed here may also appear at the neighboring level.
All hardness 9 minerals (3)
Frequently asked questions
What common minerals have a hardness of 9?
Ruby, Sapphire, and Corundum all sit at Mohs 9.
What scratches a mineral with hardness 9?
Anything harder on the Mohs scale: diamond (hardness 10) and above. It scratches glass, steel and even quartz; only harder gems will mark it.
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