The Color of Stone . . . 
Everything You Should Know About Granite And Marble
Although both were created deep within the earth milltions of years ago, the processes that formed them were quite different.
Granite is an igneous rock, which means that one time during
its development, it was melted like volcanic lava. Unlike
lava, however, this melted (or molten) rock never reached
the surface. It remained trapped inside the earth, where
it slowly cooled and crystallized, resulting in a very uniform,
speckled stone that ranges in color from black and gray tones
to pinks, browns, reds, greens and whites.
Marble is a metamorphic rock. It was once limestone, but over time, the combination of intense heat and pressure caused the limestone to re-crystallize. Foreign substances often entered the stone during this process, creating an infinite variety of colors, asters, and veining. Marble is a lot like people: no two are exactly alike.
Marble and Granite are quarried throughout the world with a large portion of it shipped to Italy, the hub of the world for the natural stone industry. Once in Italy, a gang saw is used to slice the large blocks into 3/4" and 1-1/4" thick slabs. The faces of these slabs are then polished to a high gloss finish. The slabs then get crated in the original order form which they were cut. Each crated bundle contains approximately 8-12 slabs. Once they are crated they await shipment to fabricators around the world.
Which Should I Use Where?
It depends on the effects you want to achieve and how much
use or abuse the stone will be subjected to.
Granite is striking, functional and the most durable. These traits make granite ideal for kitchen counter tops, accent islands, bar tops, everyday dining tables, and all uses!
Marble is one of the most elegant and luxurious of stones. Marble's beauty will last for generations. It is versatile enough for use throughout the house, such as fireplace facings, ornamental furnishings, walls and window sills.
Marble shines best in the bath. You can use it on almost every surface, including vanities, shower walls, tub desks and flooring.
What About Cost?
Initially marble and granite cost about the same as other solid surfaces, but price must be weighed against performance. The durability, longevity and natural beauty of marble and granite will usually outlive the home's occupants.
Marble and granite are far more valuable than synthetics in much the same way that diamonds are more valuable than rhinestones. The natural depth and character cannot be matched by any man-made surface. Natural stone does not depreciate with time and adds value to your home.