Rocks & Minerals with a Mohs Hardness of 8
On the Mohs scale, hardness 8 is defined by topaz. The 8 rocks and minerals below fall at or within the 8 to 9 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 8 minerals (8)
Frequently asked questions
What common minerals have a hardness of 8?
Alexandrite, Topaz, Spinel, Beryl, and Chrome all sit at Mohs 8.
What scratches a mineral with hardness 8?
Anything harder on the Mohs scale: corundum (hardness 9) and above. It scratches glass, steel and even quartz; only harder gems will mark it.
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