Fluoro-richterite

Template:Infobox mineral Fluororichterite is a rare amphibole with formula Na(NaCa)Mg₅Si₈O₂₂F₂.

Occurrence

Fluororichterite was first reported from the Ilmen Nature Reserve, Ilmen Mountains, Chelyabinsk Oblast', Southern Urals, Russia. It was recognized by the International Mineralogical Association in 1994. Its name is derived from its fluorine content and relation to richterite.<ref name=Mindat>Fluororichterite: Mindat.org</ref>

At the type locality in the Ilmen Mountains fluororichterite occurs in carbonate veins in amphibolites and ultramafic rocks.<ref>Type locality, Ilmen Mtns</ref> In the Essonville occurrence in Wilberforce, Ontario it occurs in a limestone lens within a gneiss and is associated with phlogopite and calcite.<ref>Essonville location, Mindat</ref> It has also been reported from Austria, Germany, Italy, Spain and China.<ref name=Mindat/> At Coyote Peak in the Coastal Range, Humboldt County, California, it occurs with a variety of rare minerals in an alkaline mafic diatreme.<ref>Coyote Peak, Mindat</ref>