Ilmenite is a mineral that is common but hardly ever faceted. Ilmenite is a black, opaque mineral with high density, metallic lustre and is Anisotropic. Faceted gems are attractive due to these characteristics. Ilmenite is one in every of the foremost important ores of the metal titanium. it’s strip-mined as a very important industrial mineral in many deposits throughout the globe. several of these deposits square measure in significant alluvial deposit sands. ilmenite is extremely similar in structure to iron ore and is actually constant as iron ore with roughly half the iron replaced with titanium.

Category: Oxide mineral
Chemical Formula: FeTiO3
Crystallography: Trigonal – Rhombohedral
Crystal Habit: Crystals are thick tabular crystals, with a dominant base, to rhombohedral, to 25 cm. Skeletal, granular, massive; as lamellar exsolutions in hematite or magnetite.
Twinning: Simple on [0001]; lamellar on [1011]


Cleavage: None
Fracture: Conchoidal to Subconchoidal
Tenacity: Brittle
Moh’s Hardness: 5.0 – 6.0
Density: 4.68 – 4.76 (g/cm3)
Luminescence: None
Radioactivity: Not Radioactive
Other: Weakly Magnetic


Color: Iron-Black, Black, Dark Gray with a brownish tint in reflected light
Transparency: Opaque
Luster: Metallic, Sub Metallic
Refractive Index: 2.40 – 2.42  Uniaxial ( – )  Anisotrophic
Birefringence: 0.00 Anisotrophic
Dispersion: n/a
Pleochroism: Weak; dark brown/pinkish brown
Anisotrophism: Strong; color in reflected light: grayish white with brown tint; bireflectance: strong;O = pinkish brown, E = dark brown