The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists

Barites from some manganese ore deposits in the Tanbe mountain region

Toyofumi Yoshimura, Mayumi Yoshinaga

1960 Volume 44 Issue 1 Pages 1-6
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.1

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Barites, beautiful green in color, were found at several manganese ore deposits in the Tanba mountain region, Kyoto Prefecture. They occur as isolated grains or minute veinlets in so called massive “chocolate” ores.
Some mineralogical properties of a specimen from the Kihata mine were determined as follows:
G=4.1(10°C)
Nx=1.636, Ny=1.637, Nz=1.646
Nz-Nx=0.010, (+)2V=39°
The results of chemical analyses and an X-ray diffraction analysis are shown in Tables 2 and 3.

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Infrared study of some phosphate minerals

Keiichi Omori, Toshikazu Seki

1960 Volume 44 Issue 1 Pages 7-13
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.7

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The infrared spectra of six phosphates of (a) xenotime and (b) monazite from Ishikawa, Fukushima Prefecture, (c) apatite from Kurokura, Kanagawa Prefecture, (d) apatite from Durango, Mexico, (e) pyromorphite from Matsuhodo mine, Miyagi Prefecture, (f) vivianite from Ashio mine, Tochigi Prefecture and (g) autunite from Grafton, New Hampshire, U. S. A. are shown in Figure 2. All the spectra have broad bands at the 9 and 9.5 microns which are caused by PO₄ molecules.

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Jamesonite from Chichibu Mine, Saitama Prefecture

Toshikazu Seiki

1960 Volume 44 Issue 1 Pages 14-17
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.14

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Jamesonites occur as aggregates of acicular crystals from Chichibu Mine, Saitama Prefecture. Form {110} and {001} have been observed. Specific gravity determined by pycnometer is G^15°_4°=5.616. Cell contents determined by X-ray diffraction chart of Geigerflex are a=15.72A, b=19.16, c=4.05, β=91°48´. Right handed and left handed twistings of prisms are recognized, which might depend on its atomic arrangement.

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Determination of the chemical composition of chlorites by the X-ray and optical methods

Haruo Shirozu

1960 Volume 44 Issue 1 Pages 18-22
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.18

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X-ray and optical methods are developed for determining the chemical composition of well-crystallized iron-magnesium chlorites. The tetrahedral Al content is determined from the basal spacing, and the Fe/Mg ratio from either the refractive index (N_Y) or the b dimension. The higher order reflections are valid for the rapid measurement of the cell dimensions.

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Thermal study on some cryptomelanes

Kokichi Okada

1960 Volume 44 Issue 1 Pages 23-33
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.23

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Cryptomelanes from some different localities in north-eastern Japan were studied by means of X ray powder method and differential thermal analysis.
Differential thermal curve of pure cryptomelane is characterized by a single endothermic peak at 830-930°C corresponding to the conversion of cryptomelane to hausmannite, Mn₃O₄. D. T. A. curves of four samples consisting only of cryptomelane showed that comparatively much quantity of pyrolusite and, or γ-type ramsdellite is mingled in these samples.

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Minor elements in sphalerite from xenothermal deposits

Kunihiko Muta

1960 Volume 44 Issue 1 Pages 34-43
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.34

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Porphyritic albite from the branched ore body of Kieslager in the Sambagawa crystalline schists in Shikoku District

Kazuo Yamaoka

1960 Volume 44 Issue 1 Pages 44-46
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.44

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Differentiation of quartz dolerite dyke of the hypersthenic rock series, Kabeshima island, Saga Prefecture

Ken-ichiro Aoki

1960 Volume 44 Issue 1 Pages 47-53
Published: February 01, 1960
Released on J-STAGE: August 07, 2008

DOIhttps://doi.org/10.2465/ganko1941.44.47

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A thick quartz dolerite dyke (belong to calc-alkali rock series or hypersthenic rock series) of late Miocene age has been found in Kabeshima island, Saga Prefecture. The dyke is intruded into the sandstone of the Miocene and is covered by trachybasalts of Pleistocene. After the intrusion, quartz dolerite magma fractionated small segregation veins of granophyric composition by crystallization differentiation in situ. The chemical composition of the granophyre is similar to those of granitic rocks.
It is considered that the quartz dolerite magma is produced by crystallization differentiation associating with contamination of granitic rocks of a tholeiite magma. A trend of the differentiation of tholeiite-quartz dolerite-granophyre is proceeded toward alkalies, without iron enrichment in the middle stage. This trend accorded with that of basalt-andesite-dacite-rhyolite of the hypersthenic rock series of the Izu-Hakone district.

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[title in Japanese]

1960 Volume 44 Issue 1 Pages 60-72
Published: 1960
Released on J-STAGE: July 13, 2012

DOIhttps://doi.org/10.2465/ganko1941.44.60

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