magnesiotitanite

Magnesiotitanite is a mineral belonging to the perovskite group. Its chemical formula is MgTiO3, indicating it is a magnesium titanium oxide. It is isostructural with perovskite (CaTiO3) and has a cubic crystal system. Magnesiotitanite forms a solid solution series with other minerals in the perovskite group, particularly with calcium titanate (CaTiO3) and iron titanate (FeTiO3). It is often found as fine-grained disseminations within igneous rocks, especially those of alkaline affinity.

The mineral typically occurs as small, black, opaque crystals or grains. It is relatively rare and is not considered a major ore mineral. Its geological significance lies in its role as a tracer for specific geological processes and as a component in understanding the geochemistry of titanium and magnesium in certain rock types. Magnesiotitanite has been identified in various locations worldwide, often associated with rocks like syenites and ijolites. Its physical properties include a Mohs hardness of around 5 to 5.5 and a density of approximately 4.5 to 4.6 g/cm³. The refractive index is typically high, contributing to its opaque appearance.