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An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.

ment, being of almost universal occurrence, usually in the form of an oxide (as hematite, magnetite, etc.), or a hydrous oxide (as limonite, turgite, etc.). It is reduced on an enormous scale in three principal forms; viz., cast iron, steel, and wrought iron. Iron usually appears dark brown, from oxidation or impurity,…

A piece of magnetic iron ore possessing polarity like a magnetic needle. See Magnetite.

ns of the phenomena of magnetism. -- Magnetic iron, or Magnetic iron ore. (Min.) Same as Magnetite. -- Magnetic needle, a slender bar of steel, magnetized and suspended at its center on a sharp-pointed pivot, or by a delicate fiber, so that it may take freely the direction of the magnetic meridian. It constitutes the…

Iron sesquioxide in isometric form, probably a pseudomorph after magnetite.

allization; distinguished from common or prismatic borax. -- Octahedral iron ore (Min.), magnetite.

ecular iron ore; -- prob. so called in allusion to its feeble magnetism, as compared with magnetite.

Containing or affording titanium; as, titaniferous magnetite.