So we strive for the hardest most attainable and attractive option in stones which happens to be granite and quartz.
Is granite the hardest rock.
The igneous rock is comprised of mostly quartz and feldspar along with smaller amounts of various other minerals.
Granite is hard enough to resist abrasion strong enough to bear significant weight inert enough to resist weathering and it accepts a brilliant polish.
But in the 1960s when i began learning rock classification a quartzite was a sandstone that was composed predominantly of quartz and cemented with sili.
These two stones have a mohs hardness rating of 6 or 7.
Marble is a degree or two less and though it is still a very hard stone it s rating on the mohs scale is about a 5.
More than that granite is the signature rock of the planet earth itself.
Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.
Strictly speaking granite is an.
That is an old classification and i am not sure the classification still exists.
An example of the hardness of a granite countertop can be seen in the fact that a knife blade will not scratch the surface.
The other rocky planets mercury venus and mars are covered with basalt as is the ocean floor of earth but only earth has this beautiful and interesting rock type in abundance.
Granite is the signature rock of the continents.