Granites are igneous rocks which contains fine granular minerals. Often used as building stone and for other purposes. Also used in commercial buildings, industries and as tomb stones. It contains feldspar, quartz and other minerals.
The process of metamorphism of dolostone or limestone results in the formation of marble stones. Full re-crystallization of crystals of the original rock takes place in order to let space for formation of marble naturally.
Sandstone is a popular sedimentary rock and covers up to 10% to 20% of all the sedimentary rocks. Most common of surface rocks is sedimentary rocks. Composition of sandstone is shale, mudstone, and siltstone.