Pretty soft. Hardness is around 2.5 to 3, depending on the aluminum alloy.
Aluminum Oxide is roughly 8.5 - 9.0 on the hardness scale.
how hard is diatomite on mohs scale
Quartz has the value of 7 on the Mohs scale.
Amber is 2-3 on the mohs scale of hardness.
It is about 2.5 in the Mohs Hardness Scale.
1.2 mohs
Extremely hard about 9.5 on Mohs' scale
Tourmaline has a hardness of 7-7.5 on the Mohs hardness scale.
4
9 on the mohs scale
The hardness of uranium is 6 on the Mohs scale; not so hard.