Martin Marietta Materials, Inc. is the producer of aggregates products (crushed stone, sand, and gravel) for the construction industry, including infrastructure, nonresidential, residential, railroad ballast, agricultural, and chemical grade stone used in environmental applications. The Company operates in four business segments: the Mideast Group, Southeast Group, and West Group and the Specialty Products segment. The Specialty Products segment includes the magnesia-based chemicals and dolomitic lime businesses. The Company's aggregates business also includes asphalt products, ready mixed concrete, and road paving operations. The Company also has a Specialty Products segment that manufactures and markets magnesia-based chemical products used in industrial, agricultural, and environmental applications, and dolomitic lime sold primarily to customers in the steel industry.