Manganese easy to oxidize. Manganese metal and its common ions are paramagnetic. Manganese tarnishes slowly in air and oxidizes ("rusts") like iron in water containing dissolved oxygen. Naturally occurring manganese is composed of one stable isotope, Mn. Eighteen radioisotopes have been isolated and described, ranging in atomic weight from 46 u (Mn) to 65 u (Mn). The most stable are Mn with a half-life of 3.7 million years, Mn with a half-life of 312.3 days, and Mn with a half-life of 5.591 days. All of the remaining radioactive isotopes have half-lives of less than three hours, and the majority of less
SS Manganese was sold to the Sinai Manganese Co, Egypt and was renamed "Manganese". The ship was deleted from Lloyd's Register in 1993. SS Manganese Manganese was a coaster that was built in 1925 by Norderwerft AG, Hamburg, Germany as Wiedau for German owners. She was seized by the Allies in May 1945, passed to the Ministry of War Transport (MoWT) and was renamed Empire Contract. Later that year, she was transferred to Greece and renamed "Herakleion". She was sold into merchant service in 1948 and renamed Laconia. In 1965, she was sold to Egypt and renamed "Manganese". The ship was deleted