<研究>粉末ボーキサイトの X 線反射(第二報)(ボーキサイトの礦物學的研究)

概要

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In the first report of this study, the mineralogical studies of bauxites from the nine different localities were described. In that case, the X-ray photographs of the powdered bauxites and their burned materials were simply used for the recognition of the mineral varieties existing in the bauxites, whose refractive indices were already measured. In the present case, the distances of the diffraction lines were measured in order to determine the indices of the net planes corresponding to these lines, the results being given in Tables from 1 to 8. By these results we can see that the mineral varieties contained in the bauxites are the same as those determined by the optical method. From the characteristic combinationes of the indices of the net planes the space groups of these minerals were determinable as V^<16>_h for diaspore, V^<17>_h for bohmite, C^5_<2h> for gibbsite and D^6_<3d> for α-Al_2O_3. The present studies were carried out under the codial directions of Prof. S. Kozu, to whom the author's genuine appeciations are due, and also he is gratiful to Ass. Prof. K. Takane for the helpful guidances.
東北大学の論文