The answer is nor reliable
The hardness scale
i think softness and hardness
HARDNESS
Streak, hardness, and crystalline structure.
hardness, luster, cleavage and fracture, color (not quite useful) and streak
Mineralogists often use the physical properties of minerals to identify them. The most reliable test in order to identify a mineral is the test for hardness.
Magnesiusm chloride is a salt.it is neither acid nor base.it is also a hardness causing substance in water
what is the difference between Shore-A Hardness & Barcol Hardness
no one likes your Hardness! hardness is not a good character.
The hardness of conundrum is 9 on the Moh's hardness scale
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
I don't found the Mohs hardness of plutonium but: - the Brinell hardness is 242 at r.m. - the Vickers hardness is 255 at r.m. After a hardness conversion chart an equivalent Mohs hardness may be 3,7.