Martin Marietta Magnesia Specialties LLC, a subsidiary of Martin Marietta, manufactures the widest range of high purity magnesium oxide and magnesium hydroxide in the world and is also a major producer of chemical grade dolomitic limestone.

Our major manufacturing facilities are located in Manistee, Michigan and Woodville, Ohio.

Regional processing and distribution facilities are strategically located throughout the world to best serve our customers.

Division Headquarters
8140 Corporate Drive, Suite 220
Baltimore, MD USA 21236
Phone: 800-648-7400 or 410-780-5500
Fax: 410-780-5777


Magnesia Chemicals Facility
1800 East Lake Road
Manistee, MI 49660
231-723-1300


Dolomitic Lime Facility
755 Lime Road
Woodville, OH 43469
419-849-4200


Product Application Center
7164-J East Furnace Branch Road
Glen Burnie, MD 21061
800-840-9590 or 410-761-8392

Please see our Contact Us page for sales and technical contact information.