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It is about 2.5 in the Mohs Hardness Scale.
9 on the mohs scale
Google "Mohs hardness scale". This is a relative hardness scale which compares one mineral's hardness to another. (It is between 3.5 and 5.5 on the Mohs hardness scale)
On the Mohs scale, 6.5 to 7.0.
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Moh's scale is a HARDNESS scale, not a HARNESS scale.
It depends on the definition of 'hard' or 'soft'. The minerals composing pumice may be quite hard, but due to the thinness of its vesicular walls, it can comparatively easily be crushed or fractured.
the Mohs hardness scale
Talc is the softest mineral on the 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.
Tourmaline has a hardness of 7-7.5 on the Mohs hardness scale.
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9 on the mohs scale
Extremely hard about 9.5 on Mohs' scale