The term “marble” is taken from the Greek word “marmaron” which means to shine or shimmer, or crystalline rock. It was popularly used as material for sculpting because it had a translucent gleam that was hard to resist. Marble is a metamorphosed rock, meaning it was once something that changed into something else. In this case, marble was once a block of carbonate rock, usually dolomite or limestone. The essential character of the original rock (prololith) changed under intense heat and pressure, which destroyed the original structure of the carbonate. As the pressure eased, the carbonate mineral reformed into interlocking crystals, forming marble. The white marble described above is formed from nearly pure limestone. The veined and colored marble which most of us are familiar with resulted from a prololith that mixed with other minerals such as iron, sand, clay, or silt during crystallization, resulting in the many variations we see today.