The definition of Granite differs when used in a construction or commercial sense from its geological definition. A geologist might define granite as a coarse-grained, quartz- and feldspar-bearing igneous rock that is made up entirely of crystals. However, for commercial granite, any feldspar-bearing rock with interlocking crystals that are large enough to be seen could be termed granite which will include rock such as anorthosite, gneiss, granite, granodiorite, monzonite, syenite, gabbro and others.

These 30mm thick slabs will be used for granite countertops

Rocks sold under the name “granite” are produced for construction use, usually sold as blocks from many quarries throughout the world. These blocks vary in size and range around 2m x 2m x 3m and will be shipped to the factories. The factories will then cut the blocks into granite slabs of their required thicknesses and then from these slabs, the granite will be cut into tiles, polished, etc. to the final product.

Difference between granite and other stone

Commercial granite is any (1) crystalline rock that is (2) harder than marble (3) with large mineral grains. 

Crystalline rock is a rock that consists of mineral grains that are tightly inter-grown and locked together, making a tough, impervious surface. Crystalline rocks are made of grains that have grown together at high temperatures and pressure, rather than being made of existing sediment grains that have been cemented together under gentler conditions. That is, they are igneous or metamorphic rocks rather than sedimentary rocks. This differentiates commercial granite from commercial sandstone and limestone.

Marble is a crystalline, metamorphic rock, but one that consists largely of the mineral calcite. Granite does not contain calcite but instead consists of much harder minerals, mostly feldspar and quartz. This differentiates granite from commercial marble and travertine.
Commercial granite has all its minerals visible as individual grains, which is the origin of the word “granite.” This differentiates granite from commercial slate, greenstone and basalt.

The important thing about commercial granite is that, whatever its actual mineral composition, it is (1) rugged—suitable for hard use, takes a good polish and resists scratches and acids—and (2) attractive with its granular texture. You really do know it when you see it.

Popular Uses of Granite

  • Granite Countertops
  • Granite Building Stone
  • Granite Paving Stone
  • Granite Memorial
  • Granite Tiles
  • Granite Facing
  • Granite Curbs
  • Granite Monuments

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