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Granite is a much better choice of stone than marble for a kitchen. It is a common coarse-grained, intrusive igneous rock that often includes quartz, mica and feldspar. It has a natural crystalline texture and often will appear to glint in sunlight. It comes in an almost endless variety of colors, patterns and grades. On the hardness scale, granite can register up to a 7 if it is high in quartz.
Quartz is the rising challenger to granite's success, though it has yet to achieve the nearly three-dimensional appearance of granite. It is the most abundant mineral in the world. It has a hard, glossy appearance, and it consists of silicon dioxide in crystal form. Its crystalline form makes quartz a light-reflective, semiprecious gemstone. Next to the diamond, quartz is considered one of the hardest minerals, registering a solid 7 on the Mohs scale.
Read more: Differences Between Granite & Quartz Countertops | eHow.com http://www.ehow.com/about_5043121_differences-between-granite-quartz-countertops.html#ixzz22FEOrrp7