Ralstonite is a complex mineral with chemical formula Na0.5(Al,Mg)2(F,OH)6廈2O. It is an alteration product of cryolite, usually colourless. In this specimen it occurs as tiny octahedral crystals on a leached out crystalline framework as found in cryolite deposits near Ivigtut, southwestern Greenland. Width of sample is 70 mm.

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TOP26739302

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達志影像

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