Is Granite The Hardest Rock

Granite comes in at a 6 to 7 on the mohs scale meaning it is relatively hard. So we strive for the hardest most attainable and attractive option in stones which happens to be granite and quartz. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.

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The igneous rock is comprised of mostly quartz and feldspar along with smaller amounts of various other minerals.

Is granite the hardest rock.

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. Granite is the signature rock of the continents. More than that granite is the signature rock of the planet earth itself. Granite is the rock most often quarried as a dimension stone a natural rock material that has been cut into blocks or slabs of specific length width and thickness.

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. An example of the hardness of a granite countertop can be seen in the fact that a knife blade will not scratch the surface. Granite is hard enough to resist abrasion strong enough to bear significant weight inert enough to resist weathering and it accepts a brilliant polish. Granites can be predominantly white pink or gray in color depending on their mineralogy the word granite comes from the latin granum a grain in reference to the coarse grained structure of such a completely crystalline rock.

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. That is an old classification and i am not sure the classification still exists. These two stones have a mohs hardness rating of 6 or 7. Strictly speaking granite is an.

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