Rather then being an orthophosphate, it seems probable that taranakite has a structure analogous to illite, from which it can be synthesized. The proposed hexagonal structure, with a = 8.7 and c = 96 Å, is composed of 6 double layeŕs of 4[(X4O10)(OH)2], where X = P, Al and/or (H3). The Al of the. octahedral layer also may be replaced by protons (H3) to a significant extent, and the interlayer K ranges from 8 to 18 atoms for the four compositions considered. The unit cell (volume 6300 Å3) presumably contains 288 oxygens.

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First page of Hypothetical phyllophosphate structure for taranakite
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