yes
I am very sure that granite is much stronger and harder than sandstone.
no, generally darker granite is harder and weighs more, has less water absorption abilities.
yes
quartzite
Yes, diamond is harder than granite. Diamond is the hardest mineral known. And it is several times harder than granite.
Yes
Yes
yes
no one of the only known substances harder than granite is diamond
I am very sure that granite is much stronger and harder than sandstone.
no, generally darker granite is harder and weighs more, has less water absorption abilities.
silicate rocks, such as granite, gneiss, basalt, and shale.
Diamonds are harder than granite: it would be useless in this process, because of its relative 'softness'.
Granite.
That would mean coal is harder than Quartz schist. Granite is harder than graphite. No foundation for this assumption.
Quartz is usually a little more expensive than granite. Quartz is harder than granite and less likely to ship or stain, though I have had granite for over a year now in my kitchen and love it!