Martin Marietta Materials is the United States' second-largest producer of construction aggregates (crushed stone, sand, and gravel). In 2016, Martin Marietta sold 159 million tons of aggregates. Martin Marietta's most important markets include California, Colorado, Florida, Georgia, Iowa, and Texas, accounting for nearly 60% of sales. The company also uses its aggregates in its asphalt, ready-mixed concrete, and road paving businesses. Martin's specialty product business produces magnesia-based chemical products and dolomitic lime.