AMMONIUM-BEARING DIOCTAHEDRAL 2M_1 MICA FROM AIRA DISTRICT, KAGOSHIMA PREFECTURE

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概要

• 論文の詳細を見る

• Ammonium-bearing dioctahedral mica was found in an argillized vein in the hydrothermally altered andesite from the Aira district, Kagoshima Prefecture. X-ray, thermal and infrared absorption data agree with those of ammonium-bearing micas studied earlier. However the hkl reflections from x-ray analysis and a doublet band due to the Si-O vibration in infrared absorption spectra after heating at 700℃ indicate that the specimen belongs to 2M_1 polytype. The unit cell parameters are a_0=5.16 (2) Å, b_0=9.02 (2) Å, c_0=20.28 (7) Å and β=96.36°. Chemical analysis of the mineral shows a structural formula of ((NH_4)_<0.20>K_<0.51>Na_<0.18>Ca_<0.00>) (Al_<1.89>Ti_<0.00>Fe^<3+>_<0.03>Mg_<0.06>) (Si_<3.25>Al_<0.75>) O_<10> (OH)_2,and the specimen is relatively rich in sodium, and has a larger total layer charge than that of ammonium-bearing micas reported so far.

• 日本粘土学会の論文

著者

• Kawano Motoharu

  Institute Of Earth Sciences Faculty Of Science Kagoshima University

• Tomita Katsutoshi

  Institute Of Earth Sciences Faculty Of Science Kagoshima University

関連論文

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• CLAY MINERALS IN THE BOTTOM SEDIMENTS FROM KAGOSHIMA BAY, SOUTH KYUSHU, JAPAN
• X-RAY STUDIES OF REHYDRATION BEHAVIORS FOR MONTMORILLONITE
• CRYSTAL STRUCTURE OF DEHYDROXYLATED 2M_1 SERICITE AND ITS RELATIONSHIP WITH MIXED-LAYER MICA/SMECTITE
• AMMONIUM-BEARING DIOCTAHEDRAL 2M_1 MICA FROM AIRA DISTRICT, KAGOSHIMA PREFECTURE
• Clay mineralogical study on the upper 800m of 1,400m sediment core samples from Lake Biwa.

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