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Granites are usually classified as igneous rocks obtained from molten masses or magmas. There is evidence that the origin of some granites may be attributed to regional metamorphism of pre-existing rocks; rearrangement and re-crystallization taking place without a liquid or molten stage.

Granite is classified into three different groups as follows:

Fine Grain: Fine grain granites are those in which the feldspar crystals average about 1/16 to 1/8″ in diameter.

Medium Grain: In the medium grain granites the feldspar crystals average about 1/4″ in diameter.

Coarse Grain: The feldspar crystals in course grain granites average 1/2″ and greater in diameter or several centimeters in maximum dimension. Coarse grain granites have a lower density.

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