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Cryolite, Ralstonite


Cryolite : Na3[AlF6], Ralstonite : NaMgAl(F,OH)6·H2O

Photo Copyright © Knut Eldjarn  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway
A 3 mm crystal aggregate of Cryolite in a cavity lined with small crystals of Ralstonite from Gjerdingselva, Lunner, Nordmarka, N. of Oslo, Norway. The only find of Cryolite from this locality. Confirmed by XRD. Specimen and photo: Knut Eldjarn.

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