Granite
Granite is an igneous rock that is composed primarily of four minerals which are quartz, feldspar, mica, and usually hornblende. Granite is formed when magma cools very gradually far under the earth's surface. This allows crystals (which can be seen by the human eye) to form from a combination of the four minerals therefor the composition of granite and vary as to location and the amount of each mineral giving it a wide variety of colors and variations in its appearance.
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