Ilmenite
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Ilmenite is a titanium-iron oxide mineral with the idealized formula FeTiO
₃. It is a weakly magnetic black or steel-gray solid. Ilmenite is the most important ore of titanium and the main source of titanium dioxide, which is used in paints,... Wikipedia
Cleavage: Absent; parting on, and
Color: Iron-black; gray with a brownish tint in reflected light
Crystal system: Trigonal
Fracture: Conchoidal to subconchoidal
Luster: Metallic to submetallic
Optical properties: Uniaxial (–)
Other characteristics: Weakly magnetic