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|Title:||The crystal structure of girvasite, NaCa2Mg3(PO4)3(CO3)(H2O)6, a complex phosphate carbonate hydrate based upon electroneutral heteropolyhedral layers|
|Publisher:||Russian Geology and Geophysics|
|Description:||Crystal chemical formula of girvasite. As it was mentioned above, the initial formula of girvasite proposed by Sokolova and Yegorov-Tismenko (1990) on the basis of crystal-structure determination is NaCa2Mg3(OH)2H2(PO4)3(CO3)(H2O)4. However, determination of all H sites in this work revealed no hydroxyl groups or protonated PO43- anions. Instead, all O atoms not bonded to P5+ or C4+ cations form two strong hydrogen bonds each, thus belonging to H2O groups. This observation allows us to revise the crystal chemical formula of girvasite as NaCa2Mg3(PO4)3(CO3)(H2O)6. This formula excludes simultaneous occurrence of the basic (OH)- and acid (PO3OH)2- anions originally postulated for girvasite by Sokolova and Yegorov-Tismenko (1990).|
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