01/31/2012
Great source of information about granite, many of your questions can be answered here...
Granite ( /ˈɡrænɨt/) is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic. A granitic ro...