epizódait
Epizódait is a rare and complex mineral belonging to the sorosilicate group, characterized by its unique chemical composition and crystal structure. Discovered in 1978 in the Kola Peninsula of Russia, it was named after the Epizodny Massif, the geological formation where it was first identified. The mineral’s chemical formula is (Na,Ca,K)₆(Fe²⁺,Mn)₃(Fe³⁺,Al)₃(Si₆O₁₈)(Si₂O₇)(OH,F)₂, reflecting its combination of sodium, calcium, potassium, iron, manganese, aluminum, silicon, oxygen, and trace amounts of hydroxyl or fluorine.
Epizódait typically forms as a secondary mineral in alkaline igneous rocks, often associated with nepheline syenites
The mineral’s structure features isolated silicate groups, including both sorosilicates (Si₂O₇) and cyclic hexasilicate (Si₆O₁₈) units,
Due to its scarcity, epizódait is not widely traded in the mineral market, and most specimens remain