Ralstonite Mineral Gallery

Ralstonite Mineral Gallery
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Ralstonite Minerals


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Ralstonite Mineral Gallery With 2 Images

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Ralstonite: NaxMgxAl2-x(F,OH)6·(H2O)  
Cryolite: Na3AlF6

Comments: Massive cryolite with solution cavities lined with octahedral ralstonite crystals.
Location: Ivigtut, Greenland. Scale: Picture size 0.5 cm.
© John Veevaert

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Ralstonite: NaxMgxAl2-x(F,OH)6·(H2O)  
Gjerdingenite-Fe: K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(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.
© Canadian Mineralogist
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