Iron - University of Denver
Bog iron ore is limonite or goethite, deposited with the aid of iron bacteria in anaerobic swamps. ... It is used for magnetic shielding. "Supermalloy," 15.7 Fe, 79 Ni, 5 Mo, 0.3 Mn, has a saturation flux density of 8,000 gauss, a coercive force of 0.002 oersted, and a maximum permeability of 800,000.
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