Martin Marietta Materials, Inc. is a supplier of aggregates products (crushed stone, sand, and gravel) used for the construction of infrastructure, nonresidential, and residential projects. Aggregates products are also used for railroad ballast and in agricultural, utility and environmental applications. The Company's Aggregates business operates through three segments: the Mid-America Group, Southeast Group and West Group. The Company's business is categorized into Aggregates Business, Cement Business and Magnesia Specialties Business. Its Cement business is reported through the Cement segment. Its Magnesia Specialties business manufactures and markets magnesia-based chemical products used in industrial, agricultural, and environmental applications, and dolomitic lime sold to customers in the steel industry. Its Cement business produces Portland and specialty cements. It manufactures and markets, through its Magnesia Specialties business, magnesia-based chemical products.