Natural granite stone is a unique blend of intrusive igneous rocks that are cooled slowly in the deep upper part of the earth’s crust, composed of 25% to 35% quartz and over 50% potassium and sodium rich feldspars, with a common accessory mineral of less than 20% – usually clear mica, biotite (dark, iron-bearing mica), or hornblende. With the exception of biotite, these granitic minerals have a Mohs Scale hardness rating of H=7, which makes natural granite highly durable and scratch resistant. The color of granite is governed largely by that of the feldspar, usually the most abundant mineral; and it is modified to some extent by the quartz, hornblende, or mica, which create different blends and streaks of colors and produce a unique feature. Granite is a product of nature with hundreds of varieties available from all over the world, each processing unique characteristics.
Little can be done to alter the condition in which nature presents these varieties to us. However, it is these natural differences that make granite unique, valuable, and highly desirable. Because of these variations, the selection of granite should never be made on the basis of one sample only. It is recommended that the selection be based on viewing sufficient samples to show the complete range of colors of the desired stone. It is highly recommended to hand-select the granite that is right for you. Some of the most popular standard granite colors are Santa Cecilia, New Venetian Gold, Uba Tuba, Tropic Brown, and Baltic Brown. Some popular exotics include Blue Bahia, Magma Gold, Mascarellos, Black Galaxy, and Golden Crystal.
(Source of information gathered in part from the Marble Institute of America)
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