Value.—Yields thirty per cent. of iron, well adapted for steel.
Localities.—Found in granite and coal-formations, often with other ores. Plymouth, Vt.; Sterling, Mass.; Roxbury, Conn.; Antwerp, Herman and Rossie, N. Y.; Fentress and Harlem Mines, N. C.; Coal Regions of Western Pa., Virginia, Eastern Ohio, etc.
67.—Specular Iron Ore.
Occurs crystallized and in large masses, high metallic lustre; color steel-gray or iron-black; brittle; opaque except when very thin; the powder when very fine and rubbed on white paper shows red; the powder dissolves slowly in muriatic acid; by a strong heat yields a black mass which attracts the needle; gravity 5.
Value.—Yields from fifty to seventy per cent. of iron.
Localities.—Found in granite regions. Marquette, Mich.; Pilot Knob and Iron Mountains, Mo.; St. Lawrence County, N. Y.; Bartlett, Lisbon and Franconia, N. H.; Chittenden and Weathersfield, Vt.; Sauk County, Wis.
68.—Spinel Ruby.
Occurs in pyramidal crystals; glassy lustre; powder white; scratches rock-crystal; by heat becomes black; gravity 3.5.
Value.—A gem; clear specimens weighing over four carats, are valued at half the price of the diamond.
Localities.—Found in granular limestone and clay. Amity and Gouverneur, N. Y.; Franklin and Byram, N. J.; Bolton and Boxborough, Mass.