Ilitrite

Ilitrite is a mineral composed of iron, titanium, and oxygen. Its chemical formula is Fe2TiO5. It is a member of the pseudobrookite group of minerals, which are characterized by their orthorhombic crystal structure. Ilitrite is typically found as dark brown to black, opaque crystals, often occurring as small, prismatic grains or in massive form.

This mineral is relatively rare and has been identified in various geological settings. It is commonly associated with volcanic rocks, particularly those that have undergone high-temperature alteration. Ilitrite can also be found in some metamorphic rocks and in alluvial deposits derived from these parent rocks. Its formation often involves the oxidation of iron and the incorporation of titanium during magmatic or metamorphic processes.

The physical properties of ilitrite include a Mohs hardness of approximately 5.5 to 6, indicating it is moderately hard. Its specific gravity is around 4.4 to 4.5. Due to its opaque nature, it does not exhibit noticeable cleavage, and its fracture is typically conchoidal to uneven. Ilitrite is insoluble in common acids.

While not economically significant as a primary ore of iron or titanium, ilitrite is of interest to mineralogists and geologists for understanding specific geological environments and mineral formation processes. Its presence can serve as an indicator of certain conditions within igneous and metamorphic terrains.