Gjerdingenite-Fe  Ralstonite   Image

Gjerdingenite-Fe Ralstonite Image

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 Gjerdingenite-Fe, Ralstonite

Large Gjerdingenite-Fe Image

Mineral: Gjerdingenite-Fe: K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O)  
Ralstonite: NaxMgxAl2-x(F,OH)6·(H2O)
Comments: SEM photomicrograph of gjerdingenite-Fe. The mineral is dusted with tiny crystals of two phases. At high magnification, one of them is seen to form cubes and is probably ralstonite.
Location: Gjerdingselva, Lunner, Oppland, Oslo Region, Norway.
Scale: Crystal length 0.5 mm.
Copyright: © Canadian Mineralogist
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