There are 5 industrially important minerals of Iron. The five are: Hematite,Magnetite,Limonite,Goethite and Siderite. Each mineral has its own color streak. Hematite no matter its color, is always red or red-brown Limonite's streak is always yellow. Magnetite has a black streak Siderite has a white or pale-brown streak. Goethite has a brown,brownish-yellow to orange-yellow streak.