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Gjerdingenite-Fe, Ralstonite
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| 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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