fluoro-richterite
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Fluororichterite is a rare amphibole with formula Na(NaCa)Mg5Si8O22F2.
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- Occurrence
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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.
Excerpted from Wikipedia’s “fluoro-richterite” article, available under the CC BY-SA 4.0 licence.