Abstract
Lath-shaped mica clay minerals found in clay veins in granitic rocks were examined by means of TEM, SAD, SEM and TEMSCAN. The lath-shaped units are 0.5-5 μm in length, 0.1-0.5 μm in width and ca. 100 A in thickness. These units seem to be 1M or 1Md polytype. The lath-shaped units seem to be associated with the (020) planes, if they are referred to 1Md mica cell. Therefore, these lath-shaped units are elongated parallel with the α-axis. Characteristic hexagonal net pattern is obtained in electron diffraction pattern of the lath-shaped unit. The two brightest inner spots are considered to be (02). Si content of lath-shaped unit is slightly higher than that of normal-shaped unit, while Al, Mg and K contents of the former are slightly lower than those of the latter.
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