VANADIUM-BEARING GREEN MICA FROM THE JANGSAN QUARTZITE IN THE JANGGUN MINE AREA, REPUBLIC OF KOREA
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概要
- 論文の詳細を見る
Green mica which had been found in the Jangsan Quartzite (metamorphosed orthoquartzite) of Cambrian age, exposed in the Janggun mine area, Republic of Korea, was mineralogically investigated. As a result, it has been confirmed that the mineral is vanadium-bearing muscovite containing a small amount of chromium. The mineral flakes occur mainly along the boundaries between quartz grains, closely associated with vanadium tourmaline and graphite. The mineralogical properties of the dark green variety may be summarized as follows. Basal cleavage is very perfect, optically negative, 2 V=35°36'(observed), 31°10'(calculated). Refractive indices : α_D=1.573,β_D=1.610,γ_D=1.613,γ_D-α_D=0.040 (all±0.001). Density (calculated)=2.84 g/cm^3. Analysis by electron microprobe gave : SiO_2 44.70,TiO_2 0.53,Al_2O_3 31.03,Cr_2O_3 0.80,V_2O_3 5.09,FeO 0.89,MgO 0.56,Na_2O 0.34,K_2O 10.51,sum 94.45 (all in weight percent). This corresponds to the formula on the basis of O=22 : (Na_<0.09> K_<1.83>)_<Σ1.92> (Al_<3.10> Ti_<0.06> Cr^<3+>_<0.09> V^<3+>_<0.56> Fe^<2+>_<0.09> Mg_<0.11>)_<Σ4.01> (Si_<6.11> Al_<1.89>)_<Σ8.00>O_<22>. X-ray study showed the mineral to be two-layer monoclinic, 2 M_1 polytype, space group C 2/c or Cc with a=5.210,b=9.032,c=20.086 Å, β=95°38'. The strongest reflections (30 given) are, 10.01 (66) (002), 5.00 (24) (004), 4.48 (12) (110), 3.50 (11) (114), 3.34 (100) (006), 3.21 (12) (114), 2.996 (15) (025), 2.866 (13) (115), 2.797 (10) (116), 2.571 (16) (202), 1.997 Å (31) (00・10). TG curve shows the gradual and continuous weight decrease from 100 to 1000℃. DTA curve shows extremely broad endotherm with a maximum at 600〜700℃. The infrared absorption spectrum is almost identical with that of normal muscovite. The strong absorptions are ; 3630 cm^<-1> in OH stretching region, 471,530,750 cm^<-1> and a triple at 1080,1035,990 cm^<-1> in lattice vibration region. The material is shown in electron micrographs to occur in small, poorly-defined flakes commonly grouped together in irregular aggregates. Selected-area electron diffraction pattern from a thin, single particle shows the hk diffraction spots with a pseudo-hexagonal array. From the geological environments of the Janggun mine area and the mode of occurrence of the present green mica, it may be concluded that vanadium and chromium present in the mineral are primary constituents, and that the mineral is of metamorphic origin rather than hydrothermal or metasomatic.
- 日本粘土学会の論文
著者
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Machida Minoru
Department Of Mineral Industry School Of Science And Engineering Waseda University:(present Adress)t
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Lee Hyun
Department Of Mineral Industry School Of Science And Engineering Waseda University
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Lee Hyun
Department Of Anesthesia And Pain Medicine School Of Medicine Pusan National University
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Imai Naoya
Department Of Mineral Industry School Of Science And Engineering ; Science And Engineering Research
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Imai Naoya
Department Of Mineral Industry School Of Science And Engineering Waseda University
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