Chemistry:Fluororichterite
| 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.[4] In the Essonville occurrence in Wilberforce, Ontario it occurs in a limestone lens within a gneiss and is associated with phlogopite and calcite.[5] 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.[6]
References
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