titaninit
Titaninite is a mineral belonging to the oxide group, specifically a calcium titanium oxide with the chemical formula CaTi2O5. It is a rare mineral and is known for its distinctive crystal structure and optical properties. Titaninite is typically found in igneous rocks, particularly those that are rich in titanium and calcium. It can also occur in metamorphic rocks under specific conditions. The color of titaninite can vary, commonly appearing as brown, reddish-brown, or black. Its luster is usually vitreous to resinous. While titaninite is not a common ore mineral, its presence can be indicative of certain geological environments. It is sometimes found in association with other titanium-bearing minerals such as ilmenite and rutile. The mineral was first described in the 1960s. Due to its rarity and specific occurrences, titaninite has limited commercial applications. Research into its properties and occurrence continues within the field of mineralogy and geology to better understand its formation and distribution within the Earth's crust.