Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earth’s surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other minerals.

Granite. The only natural stones harder than granite are diamonds, rubies, and sapphires. … Granite has performed second only to stainless steel in ability to resist bacteria. The hardest natural material available for countertops, it is composed of a variety of minerals such as quartz, feldspar, and mica.

Granite is used in buildings, bridges, paving, monuments, and many other exterior projects. Indoors, polished granite slabs and tiles are used in countertops, tile floors, stair treads and many other design elements.