Martin Marietta Magnesia Specialties

Martin Marietta Magnesia Specialties is a subsidiary of Martin Marietta and a global leader in the manufacture of high purity magnesium oxide, magnesium hydroxide, and dolomitic lime products. The company serves a broad range of environmental, industrial, chemical, and specialty application markets, supplying critical mineral-based inputs to customers both domestically and worldwide. Its product portfolio includes magnesium hydroxide in slurry and powder forms, a wide variety of magnesium oxide products with varying chemistries and physical properties, and dolomitic lime — making it one of the most comprehensive magnesia-focused suppliers in North America. The company holds the distinction of being the largest producer of high purity dolomitic lime in North America, a position that underscores its scale, technical expertise, and market relevance in the minerals processing sector. Primary manufacturing operations are headquartered at two key facilities: a magnesia plant located in Manistee, Michigan, and a dolomitic lime plant in Woodville, Ohio. In addition to these production centers, the company leverages a network of global and domestic distribution points to efficiently reach customers across diverse geographies and industries. High product quality and consistency are emphasized as core differentiators, with technical data sheets available to guide customers through product selection for specific applications. The company's magnesium oxide and magnesium hydroxide products are particularly valued in environmental applications such as wastewater treatment and flue gas desulfurization, as well as in industrial and chemical processing where precise mineral chemistry is critical. As part of the larger Martin Marietta organization, the company benefits from significant corporate infrastructure, financial stability, and broad materials science expertise, enabling it to maintain rigorous production standards and serve demanding B2B customers across multiple sectors.