The rare fluoride, ralstonite, is found in small, clear, colorless octahedrons with cryolite and thomsenolite at Ivigtut, Greenland. It has also been reported from Colorado and Japan, but only the Greenland material has been analyzed. The best analyses of ralstonite are those of Brandi and of Penfield and Harper. From these analyses Penfield and Harper calculated the formula, (Mg,Na)2)Al)3(F-OH))11.2H2O.

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