The crystals of indium tellurides and selenides, InTe, In₂Te₃, InTe₃, InSe and In₂Se₃, have been synthesized by the double-furnace technique and their crystal lattices have been characterized by X-ray single crystal examinations.
From the results of their electrical conductivity measurements it has been found that all of them are semiconductors, In₂Te₃ and InSe being poorly conductive with some ionic character, InTe, InTe₃ and In₂Se₃ having rather higher conductivities of order of 1 ?? 1×10² (Ωcm)^-1 at room temperature, and that In₂Se₃ shows a peculiar phase transition at 200°C.. The lattice symmetries of these compounds have been compared with those of other III b metal chalcogenides.

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Because of felted or matted fibrous nature of crystals, the symmetry and lattice constants of szaibelyite had not been determined. However, with aid of information obtained from oscillation pattern and poor Weissenberg photographs of sussexite (manganese analogue of szaibelyite), the indexing of powder diffraction patterns of szaibelyite and sussexite was successfully carried out. The results established the orthorhombic symmetry of the szaibelyite-sussexite series. The lattice constants found from X-ray powder data are:
a₀ b₀ c₀
szaibelyite (Mg, Mn)HBO₃ 10.34Å 12.45Å 3.21Å
sussexite (Mn, Mg)HBO₃ 10.61 12.65 3.30
The variation of the lattice constants with changing chemical composition for the szaibelyite-sussexite series is discussed together with possible space groups.

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The crystal of ullmanite from Sakhendorf, Siegerland has the lattice constant a₀=5.881±0.002Å.. Single crystal investigation confirmed the predicted space group T⁴-P2₁3 and the crystal structure was established by means of the two dimensional Fourier method. The bond distances found in ullmanite are:
Ni-Sb=2.57Å
Sb-S=2.40
Ni-S=2.34.
These results give the atomic radii for Ni 1.26Å., for Sb 1.32Å. and for S 1.08Å.. The radii of antimony and sulphur found in ullmanite are close to the Huggins' values.
Since the three fold axis of the crystal is polar, the determination of the absolute structure of the crystal was also carried out. With the aid of the anomalous X-ray scattering of Zn Kα radiation by Ni atoms, correlation of the crystal structure of the crystal to the external form was made.

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Hypogene kaolin clay occurs in epithermal gold ore deposit of the Kasuga mine, as gangue mineral of vein and hydrothermal alteration product of wall rocks. They were examined under the microscope and by the X-ray powder method, and were also subjected to differential thermal analysis.
From the results of the studies, it is concluded that hypogene kaolin clay from the Kasuga mine is composed of nacrite, dickite and kaolinite. Some characteristic features in the occurrence of these minerals are described.

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It is concluded that the anomalous optical property of heikolite may be due to the elliptic vibration of light wave, resulting from the strong absorption of the mineral.
The formula for calculating the intensity of emerged light was introduced and the orientations of the major axes and the axial ratios of the ellipses, the reduction ratios of amplitudes of light wave, and the phase difference between the two elliptically polarized waves in the crystal, were determined with the heikolite section para ?? lel to (010).
The intensity curves obtained from observations were in good accordance with those obtained from calculations.

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