Granite is, quite literally, as old as the earth. It is formed from liquid magma, the molten rock still found at the core of the planet, cooled down to form a substance approaching the hardness and durability of diamond. The chemical composition of granite is similar to that of lava. However, granite owes its hardness and density to the fact that it has been solidified deep within the earth, under extreme pressure.
It is accurate to speak of "granites" because many varieties of the stone exist. While they differ in color, texture and crystalline structure, the granites have three essential minerals in common: Feldspar, Quartz and Mica. These minerals occur in different proportions, giving each granite its own color, texture and structural characteristics.
In addition, hornblende, hematite, pyrite, zircon, garnet, corundum and other minerals may be present in smaller amounts, adding to the unique coloration and texture of each granite deposit. In supplying granite for a large building or complex of buildings, it is essential that the stone be consistent in color a texture. To assure this, each granite color must be quarried from the same deposit. With natural material like granite, a certain amount of "movement" or grain in the stone must be expected. Many people find this flow and blending of colors the most compelling reason to use granite. |
