Fluoro-richterite

Fluororichterite

Fluororichterite with calcite from Wilberforce, Monmouth Township, Haliburton County, Ontario, Canada (size: 6.6 x 4.4 x 3.8 cm)

General
Category| Silicate mineral
Formula
(repeating unit)| Na(NaCa)Mg5Si8O22F2
Strunz classification| 9.DE.20
Crystal system| Monoclinic
Crystal class| Prismatic (2/m)
(same H-M symbol)
Space group| C2/m
Unit cell| a = 9.763, b = 17.89
c = 5.122 [Å]; β = 102.25°; Z = 2
Identification
Color| Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green
Mohs scale hardness| 5–6
|re|er}}| Vitreous
Streak| White
Specific gravity| 3.17
References| [1][2][3]

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.[1]

At the type locality in the Ilmen Mountains fluororichterite occurs in carbonate veins in amphibolites and ultramafic rocks.[5] In the Essonville occurrence in Wilberforce, Ontario it occurs in a limestone lens within a gneiss and is associated with phlogopite and calcite.[6] It has also been reported from Austria, Germany , Italy, Spain and China .[1] At Coyote Peak in the Coastal Range, Humboldt County, California, it occurs with a variety of rare minerals in an alkaline mafic diatreme.[7]

## References

1. ↑ 1.0 1.1 1.2 Fluororichterite: Mindat.org
2. ↑ Fluororichterite: Webmineral.com
3. ↑ "IMA Master List". http://pubsites.uws.edu.au/ima-cnmnc/.
4. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
5. ↑ Type locality, Ilmen Mtns
6. ↑ Essonville location, Mindat
7. ↑ Coyote Peak, Mindat

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