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The borate mineral Mg 1.33 Mn 1.44 Fe 0.05  · Sb 0.17 O 2 BO 3  from the Mossgruvan mine, Nordmark, Värmland, Sweden, has been studied by a combination of single crystal X-ray diffraction and electron microscopy (HREM, EELS and EDX) techniques. The HREM investigations showed that the structure belongs to the pinakiolite family, whose other members with increasing complexity are, e.g. pinakiolite, ludwigite, orthopinakiolite, takéuchiite and blatterite. The space group is orthorhombic,  Pnnm  (No. 58),  a  = 37.384(11) Å,  b  = 12.568(3) Å,  c  = 6.200(2) Å;  Z  = 32. The structural model, for which the initial coordinates could be deduced from the HREM images, has been refined versus the 2280 most significant X-ray reflection intensities with sin  θ / λ  ≤ 0.70 Å −1  to  R -value of 0.056.

The crystal structure of a blatterite mineral, Mg 1.33 Mn 1.44 Fe 0.05 Sb 0.17 O 2 BO 3 , a combined single crystal X-ray and HREM study