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An interstratified mineral of muscovite and vermiculite was found as an alteration mineral of muscovite in the crystalline shist at Mikamo-cho, Miyoshi-gun, Tokushima Prefecture. The grain size of this mineral was fairly large for taking the single crystal photograph by X-ray. The crystal structure of this mineral was estimated by X-ray powder diffraction and X-ray single crystal methods. The stacking sequence of this sample seems to be just the same with that of 2 M polytype of muscovite. The lattice constants and optical properties are as follows:<BR>a=5.228 (7), b=9.041 (8), c=25.01 (2)Å, β=94.88 (8)°, <BR>and<BR>a∧Y=3-5°, b=z, c∧X=0-4°, 2V=-31°.<BR>These optical properties are close to those of 2 M muscovite.
日本粘土学会の論文