Granite is an igneous rock, which means that at one time during its development, it was melted like volcanic lava. However, this melted (or molten) rock never reached the surface. It remained trapped inside the earth, where it slowly cooled and crystallized, resulting in a very uniform, speckled stone that ranges from blacks to whites and nearly every color in between.
Granite is composed of feldspar (usually potash feldspar and oligoclase) and quartz, with a small amount of mica (biotite or muscovite) and minor accessory minerals, such as zircon, apatite, magnetite, ilmenite, and sphene. Granite is usually whitish or gray with a speckled appearance caused by the darker crystals. Potash feldspar imparts a red or flesh color to the rock. 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
Marble is a metamorphic rock, which means the originating materials have changed, due primarily to heat and pressure. Marbles are formed primarily from calcites and dolomites. White marbles form from materials that are mostly free or silicates, while green marbles or serpentines result from the high concentration of magnesium.
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