Granite

Granites usually are 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 or pre-existing rocks. Rearrangement and re-crystallization taking place without a liquid or molten stage.

Granite is classified in (3) 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.