instrumentite

Instrumentite is a rare mineral discovered in 1997, found in the Kola Peninsula, Russia. It is named after the Russian word "instrument," reflecting its unique, complex crystal structure. Instrumentite is a complex oxide mineral, with the chemical formula (K,Na)2Na2Ca2(Ti,Nb)4O12F2. It crystallizes in the cubic crystal system and typically forms small, dark green to black crystals.

The mineral's structure is characterized by a complex arrangement of titanium and niobium octahedra, which are linked by corner-sharing to form a three-dimensional framework. This structure is unique among known minerals and has been the subject of extensive study in crystallography and materials science.

Instrumentite is of particular interest to geologists and mineralogists due to its unusual composition and structure. It is found in association with other rare minerals in alkaline igneous rocks, specifically in nepheline syenites and carbonatites. The mineral's rarity and unique properties make it a valuable subject for scientific research.

Despite its scientific significance, instrumentite is not known to have any practical applications or uses. Its rarity and the challenges associated with its synthesis make it an interesting but largely academic mineral.