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Volume 56 (1966)
- Issue 6 Pages 235-
- Issue 5 Pages 191-
- Issue 4 Pages 141-
- Issue 3 Pages 93-
- Issue 2 Pages 41-
- Issue 1 Pages 1-
Volume 56, Issue 3
Displaying 1-5 of 5 articles from this issue
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MASATOMO MUCHI, YOSHIAKI HOSHINO, ISAO FURUSATO1966 Volume 56 Issue 3 Pages 93-106
Published: September 05, 1966
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe light green mineral from the Oeyama nickel mine has been identified to be nickeliferous sepiolite being a very rare mineral by means of chemical analysis, electron micrographs, thermal curves and x-ray diffraction. Its occurrence seems to be the first recorded in Japan. The mineralogical properties generally agree with those of fibrous type sepiolites described in the literatures, but the thermal effects on this mineral are somewhat different from those on the fibrous type. From the electron micrographs and X-ray analyses, it has been confirmed that the Oeyama nickeliferous sepiolite is composed of fibrous particles which are not uniform in length and have higher crystallinity than that of the sepiolite from this mine described recently. The chemical formula for this mineral was 12 SiO2•8 (Ni, Fe, Mg) O•17H 2O. Of this 17H 2O obtained from the chemical analysis 3H 2O were considered to be possibly hygroscopic water in comparison with the Preisinger formula.View full abstractDownload PDF (2047K) -
Yôtarô Seki, Hiroshi Haramura1966 Volume 56 Issue 3 Pages 107-111
Published: September 05, 1966
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSChemical composition of yugawaralite, a kind of Cazeolites, has not been fixed. However, chemical data of this mineral with impurities of laumontite, chabazite, wairakite and calcite and physical properties such as density and unit-cell dimensions show that the chemical composition for yugawaralite must be represented by CaAl2Si6O16 • 4H2O.View full abstractDownload PDF (258K) -
formation of magnetite crystals and sealing of liner tube.Shuzo Hasegawa, Noboru Sakagami, Tokuko Sugai, Gisaku Ohara1966 Volume 56 Issue 3 Pages 112-121
Published: September 05, 1966
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe experiments of hydrothermal syntheses of ruby and zincite have been done. At that time it was observed that the inner wall of autoclave of which chemical composition is given in table 1, was corroded by basic solution, 1_??_3 mol Na2CO3 or KOH solution, under hydrothermal condition 380_??_500°C and 500_??_2000kg/cm2. Under such condition, iron metal was dissolved in basic solution as ferrites or ferrates and migrated to other places where magnetite deposits. Magnetite crystal has a octahedral habit combinated often with (100) or (101), 0.8mm in maximum size. To prevent from corrosion, stainless inner vessel with ring sealing or welding silver tube was used.View full abstractDownload PDF (1601K) -
Sakichi Ashida1966 Volume 56 Issue 3 Pages 122-132
Published: September 05, 1966
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSNickel oxide and cobalt oxide have different types of crystal structure, rock salt type (NiOa0=4.199A) and spinel type (Co3O4 a0=8.138A), respectively. A mixture of these oxides forms a solid solution with a rock salt type structure, by being heated up to a transition temperature, which depends on the mixing ratio. The transition temperatures are found to be, for example, 400°C for Co1Ni5 oxide, 630°C for Co2Ni4 oxide, 750°C for Co3Ni3 oxide, 830°C for Co4Ni2 oxide, 870°C for Co5Nil oxide and 905°C for Co6 oxide. The lattice parameter of the oxide solid solution varies from 4.203A to 4.276A with the composition of cation, according to Vegard's law.
The annealing process of this solid solution was also investigated and separation of the spinel type from the rock salt type structure was observed. In the rock salt type crystal structure of Co4Ni2 oxide, the weight increases by about 1% in the annealing process at 500°C and electrical resistivity decreases from 106Ω to 101Ω. The changes of weight and electrical resistivity were discussed in relation to the variation of the lattice parameters of the rock salt and spinel type structures.View full abstractDownload PDF (496K) -
Ken-ichiro Aoki1966 Volume 56 Issue 3 Pages 133-139
Published: September 05, 1966
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSTwo phenocrystic bronzites, one phenocrystic pigeonite and one groundmass clinopyroxene from the early stage tholeiites of Funagata volcano, northeastern Japan have been separated and analyzed chemically. The chemical compositions of these pyroxenes are as follows: Ca6.8 Mg72.0, Fe20.4, Ca7.5 Mg67.5 Fe25.0, Ca10.6, Mg61.1 Fe28.3, and Ca21.5 Mg47.6 Fe30.9, respectively. Phenocrystic bronzites are characterized by high Ca content. It shows that the possible extent of solid solution in natural bronzite is maximum 7.5 mol. per cent of CaSiO3 at the early stage of fractionation of tholeiite magma. With fractionation, pigeonite crystallizes in place of the bronzite, and this inversion occurs when the Mg: Fe ratio of the Ca poor phase is about 70:30. From the composition and optical properties of the groundmass clinopyroxene from Hawaiian and Japanese tholeiites, it is assumed that the cotectic line of the pyroxene system Di-Hd-Fs-En is situated between Wo25 and Wo30 at the early stage of crystallization.View full abstractDownload PDF (386K)
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