TY - JOUR
T1 - Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite
AU - Yang, Hexiong
AU - Zwick, Justin
AU - Downs, Robert T.
AU - Costin, Gelu
PY - 2007/9/22
Y1 - 2007/9/22
N2 - This study presents the first structural report of natural isokite (calcium magnesium phosphate fluoride), with the formula CaMg(PO4)F0.8(OH)0.2 (i.e. some substitution of OH for F), based on single-crystal X-ray diffraction data. Isokite belongs to the C2/c titanite mineral group, in which Mg is on an inversion centre and the Ca, P and F/OH atoms are on twofold axes. The structure is composed of kinked chains of corner-sharing MgO4F2 octa-hedra that are crosslinked by isolated PO4 tetra-hedra, forming a three-dimensional polyhedral network. The Ca2+ cations occupy the inter-stitial sites, coordinated by six O atoms and one F anion.
AB - This study presents the first structural report of natural isokite (calcium magnesium phosphate fluoride), with the formula CaMg(PO4)F0.8(OH)0.2 (i.e. some substitution of OH for F), based on single-crystal X-ray diffraction data. Isokite belongs to the C2/c titanite mineral group, in which Mg is on an inversion centre and the Ca, P and F/OH atoms are on twofold axes. The structure is composed of kinked chains of corner-sharing MgO4F2 octa-hedra that are crosslinked by isolated PO4 tetra-hedra, forming a three-dimensional polyhedral network. The Ca2+ cations occupy the inter-stitial sites, coordinated by six O atoms and one F anion.
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U2 - 10.1107/S0108270107041169
DO - 10.1107/S0108270107041169
M3 - Article
C2 - 17917206
AN - SCOPUS:34948880133
SN - 0108-2701
VL - 63
SP - i89-i90
JO - Acta Crystallographica Section C: Crystal Structure Communications
JF - Acta Crystallographica Section C: Crystal Structure Communications
IS - 10
ER -