Emery

• hematite

  The principal form of iron ore; consists of ferric oxide in crystalline form; occurs in...

• magnetite

  An oxide of iron that is strongly attracted by magnets.

Also contains

• iron

  A heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts;...

• taconite

  A variety of chert containing magnetite and hematite; mined as a low-grade iron ore.

• lepidocrocite

  A red to reddish brown mineral consisting of iron oxide hydroxide; often found in...

• goethite

  A red or yellow or brown mineral; an oxide of iron that is a common constituent of rus...

• ruddle

  A red iron ore used in dyeing and marking.

• chamosite

  A greenish grey or black silicate of iron and aluminum.

• limonite

  A widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocit...

• siderite

  Iron ore in the form of ferrous carbonate.