12.—Bog Iron Ore.
Occurs in masses or beds, looking much like hard brown earth; loose or porous and earthy, rather than compact and nodular; powder yellowish-brown; when strongly heated becomes black and magnetic; gravity nearly 4. An earthy yellow variety is called Yellow Ochre.
Value.—An important ore, yielding thirty-five per cent.
Localities.—Found in low, marshy grounds; widely distributed. Lebanon, N. H.; Berkshire and Plymouth Counties, Mass.; Columbia, St. Lawrence, Franklin and Jefferson Counties, N. Y.; New Limerick, Katahdin, Newfield, Shapleigh, Argyle, Clinton, Williamsburg and Lebanon, Me.; Darien and Martin Counties, Ind.; Monmouth County, N. J.; Somerset and Worcester Counties, Md.; Michigan, Ohio, Illinois, Wisconsin, etc.