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Fluoro-richterite

Field	Value
name	Fluororichterite
image	Fluororichterite-Calcite-280570.jpg
imagesize	260px
caption	Fluororichterite with calcite from Wilberforce, Monmouth Township, Haliburton County, Ontario, Canada (size: 6.6 x 4.4 x 3.8 cm)
category	Silicate mineral
formula	Na(NaCa)Mg5Si8O22F2
IMAsymbol	Flrct
strunz	9.DE.20
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/m
unit cell	a = 9.763, b = 17.89
c = 5.122 [Å]; β = 102.25°; Z = 2
color	Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green
mohs	5–6
luster	Vitreous
streak	White
gravity	3.17
references

(same H-M symbol) c = 5.122 [Å]; β = 102.25°; Z = 2 | length fast/slow = 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.

At the type locality in the Ilmen Mountains fluororichterite occurs in carbonate veins in amphibolites and ultramafic rocks. In the Essonville occurrence in Wilberforce, Ontario it occurs in a limestone lens within a gneiss and is associated with phlogopite and calcite. It has also been reported from Austria, Germany, Italy, Spain and China.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.webmineral.com/data/Fluororichterite.shtml Fluororichterite: Webmineral.com]
"IMA Master List".
[http://www.mindat.org/min-6952.html Fluororichterite: Mindat.org]
[http://www.mindat.org/loc-8247.html Type locality, Ilmen Mtns]
[http://www.mindat.org/loc-73287.html Essonville location, Mindat]

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

calcium-minerals magnesium-minerals sodium-minerals fluorine-minerals amphibole-group monoclinic-minerals minerals-in-space-group-12

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