The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. Now there is a standard table where minerals are given standard Mohs hardness value. Talc has Mohs hardness value 1 that means it is the least hard mineral while diamond has Mohs hardness value 10 which means it is the hardest mineral. Most of the minerals found on Earth have been assigned a Mohs value. But is this scale applicable for minerals found on other terrestrial planets i.e. Mercury, Venus, Mars?
- Mercury contains various silicate minerals of magnesium, aluminum and calcium and iron. (source)
- Venus contains pyrite, magnetite, anhydrite found in surface basalts and rhyolites. See more examples here
- Mars is a mineral rich planet. The dust that covers the surface of Mars is fine like talcum powder. Beneath the layer of dust, the Martian crust consists mostly of volcanic basalt rock. See Composition of mars for more information.
Can these rocks and minerals be assigned a Mohs Hardness value? Why/Why not?
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