黄鐵鑛の特性について(第3報)
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概要
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The writers have recognized the existence or two types of pyrite, as mentioned in the previous report-Part 2., One of them was high in the electrical resistance and had a negative temperature coefficient., In contrast, the other was low in the electrical resistance and had a positive temperature coefficient., Examination by the X-ray powder method and spectrum analysis was carried out., The results obtained are shown in the diagram (Fig., 1) and Table 1., The writers also examined the etched surface of several samples of pyrite with the electron microscope., (See Fig., 2, A-F) The results of the investigation indicate that the electrical properties of pyrite such as the electrical resistance and the thermoelectric potential will be remarkably affected by the existence of a intricate structure of the crystal domain in pyrite and the mode of arrangement of the domain rather than by chemical composition of the pyrite (the ratio of sulphur to iron), or impurities., The thermoelectric potential of powdered samples of pyrite which were separately mixed with quartz, zincblende, and magnetite were measured., The effect was almost neglizible when the material mixed with the pyrite was less than 5% of the total sample., (See Fig., 3) Measurement of the thermoelectric potential was carried out on samples of pyrite from the Taro deposit., It was gradually higher in value in the middle part of the vein, on which the sample to be examined was taken across it between both walls., Therefore, it might be taken that the formation temperature of pyrite was of the highest in the middle part of the vein., (See Figs., 4 and 5) In the Yanahara deposit, measurement of the thermoelectric potential of pyrite was carried out at the place where a part of the ore body was changed to pyrrhotite and magnetite by thermal metamorphism of a quartz porphyry dyke., The measurement, indicates that the temperature of the pyrite which was originated by thermal metamorphism was gradually higher in the pyrrhotite zone., (See., Figs., 6, 7 and 8)
- 日本地質学会の論文
- 1953-10-25