The Crystal Structure of Phlogopite by Neutron Diffraction

J. H. Rayner
Pedology Department, Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ

Summary: The positions of all the atoms including hydrogen have been found by a partial three-dimensional single-crystal neutron-diffraction study in which about one-third of the reflections in the reciprocal sphere to 1·5 Å were measured. The hydroxyl group is perpendicular to the plane of the silicate sheets. The fluorine content of this phlogopite is enough to occupy 25 % of the (OH, F) sites. Site occupancy refinement suggests that there is a small deficiency of hydrogen at the remaining sites and that the two crystallographically different octahedral sites are fully occupied by the same proportions of Mg, Ti, Fe, and Ca.

Mineralogical Magazine; December 1974 v. 39; no. 308; p. 850-856; DOI: 10.1180/minmag.1974.039.308.04
© 1974, The Mineralogical Society
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