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Local anisotropy of magnetic susceptibility Δχ is detected at the surface area of an indochinite tektite, which is an amorphous silicate produced by a meteorite impact followed by rapid cooling. The observed Δχ values showed a maximum value at the surface (Δχ = 1.8 x 10-6 emu/g), which gradually decreased toward the inner direction. The local Δχ values were obtained from a period of field-induced rotational-oscillation measured for the thin plates (1.0 x 1.0 x 0.2mm) separated from the surface area; spatial resolution of Δχ depth profile was improved to a level of 0.2mm in the present study. The observed Δχ at the surface of indochinite was comparable to the value previously observed at the surface of a moldavite tektite. The existence of local Δχ at the surface of two different tektites, formed by separate events, indicated that a slight distortion of isotropic configuration may generally occur in the atomic positions of amorphous silicates, especially when they were formed by rapid cooling

Anisotropy of Paramagnetic Susceptibility Observed at the Surface of an Indochinite Tektite Detected by Field-Induced Rotational-Oscillation