Granite
Igneous rock of visible crystalline formation and texture. It is composed of feldspar (usually potash feldspar and oligoclase) and quartz (SiO2), with a small amount of mica (biotite or muscovite) and minor accessory minerals, such as zircon, apatite, magnetite, ilmenite, and sphene. Granite crystallizes from magma that cools slowly, deep below the earth's surface. Exceptionally slow rates of cooling give rise to a very coarse-grained variety called pegmatite. Granite, along with other crystalline rocks, constitutes the foundation of the continental masses, and it is the most common intrusive rock exposed at the earth's surface. The specific gravity of granite ranges from 2.63 to 2.75. Its crushing strength is from 1050 to 14,000 kg per sq. cm (15,000 to 20,000 lb. per sq. in). Granite has greater strength than sandstone, limestone, and marble and is correspondingly more difficult to quarry.
Granite is the countertop material. Impervious to heat, easy to care for, the hardest stone on earth, it is available in hundreds of color and can be used in the most demanding situations. Granite countertops will compliment any d |