Magnetite

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Other names: Lodestone (if naturally magnetic)
Mineral class: Oxide
Composition: Iron Oxide, Fe₃O₄
Hardness: 5.5 - 6
Luster: Dull Metallic
Color: Dark Grey, Black
Streak: Black
Crystal form: Granular masses. Isometric, usually octahedron, sometimes dodecahedron with striation.
Uses: Iron ore
Comments: Attracted by a weak magnet (sometimes magnetic itself). Not scratched by knife. Distinguished from massive hematite by its magnetism and black streak. [magnetite.jpg]

Other names:	Lodestone (if naturally magnetic)
Mineral class:	Oxide
Composition:	Iron Oxide, Fe₃O₄
Hardness:	5.5 - 6
Luster:	Dull Metallic
Color:	Dark Grey, Black
Streak:	Black
Crystal form:	Granular masses. Isometric, usually octahedron, sometimes dodecahedron with striation.
Uses:	Iron ore
Comments:	Attracted by a weak magnet (sometimes magnetic itself). Not scratched by knife. Distinguished from massive hematite by its magnetism and black streak.