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Volume 3 (1960 - 1962･･･
- Issue 5-6 Pages 261-
- Issue 4 Pages 181-
- Issue 3 Pages 107-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 3, Issue 2
Displaying 1-2 of 2 articles from this issue
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ICHIRO SUNAGAWA1960 Volume 3 Issue 2 Pages 59-89
Published: 1960
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSThe surface structures of hematite crystals from nine localities are observed with an ordinary reflecting and a phase contrast microscope, and the step heights of growth layers as well as the other surface features are measured precisely with multiple-beam interferometric method and the method of fringes of equal chromatic order. On the basis of these observations and measurements, mechanism of crystal growth, natural etching, twin formation and movement of screw dislocations after the cessation of growth and the possibility of polytypism are discussed in this paper. Physical and chemical conditions under which hematite crystals have grown are also discussed on the basis of characteristics of growth and etch patterns.View full abstractDownload PDF (8245K) -
TOSHIO KATO1960 Volume 3 Issue 2 Pages 90-95
Published: 1960
Released on J-STAGE: March 18, 2008
JOURNAL FREE ACCESSUranothorite from Naégi, Gifu Prefecture occurs as small grains in placers. Colour: Yellowish or reddish brown. Sp. gr.: 4.30. n: about 1.68. The result of chemical analysis of the sample from Nameri, Kitsumizawa follows, CaO 1.16, PbO 0.98, Al2O3 1.84, Fe2O3 2.54, Ce2O3 etc. 1.89, ThO2 58.17, UO2 9.05, SnO2 0.26, TiO2 0.02, SiO2 11.89, P2O5 0.59, H2O(+) 7.10, H2O(-) 4.98, total 100.47%. The main features of the specimen imply that it is a metamictized mineral belonging to the uranothorite-thorogummite series.View full abstractDownload PDF (250K)
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