tilitosite

Tilitosite is a mineral with the chemical formula Ca2Si2O6. It is a silicate mineral and a member of the melilite group. The melilite group itself is characterized by a general formula (Ca,Na)2(Mg,Fe,Al)(Si,Al)3O7 or similar variations, with tilitosite being a specific end-member. It is characterized by its distinctive crystal structure, which consists of alternating layers of silicate tetrahedra and calcium-containing layers. Tilitosite is typically found in alkaline igneous rocks, often associated with rocks rich in calcium and silica. Its formation is usually linked to processes involving low-pressure, high-temperature environments. The mineral commonly occurs as small, euhedral to subhedral crystals. Its color can vary, but it is often described as colorless to pale yellow or brown. Tilitosite is relatively rare and is not considered a common rock-forming mineral. Its presence in geological samples can provide valuable insights into the specific magmatic conditions and chemical environment of its formation. Research on tilitosite often focuses on its crystallographic properties, its occurrence in specific geological settings, and its relationship to other minerals within the melilite group.