The Raman spectra of tale microparticles have been obtained with the Raman microprobe over the frequency range 100 to 3800 cm<sup>−1</sup>. The vibrational modes are discussed in terms of an idealized unit cell (1-M polymorph) of C<sub>2h</sub> symmetry. An electro. static dipole-dipole interaction is used to compare the Raman and infrared active branches. Assignments of the Raman active stretching modes of the silicate sheet are found to support previous infrared assignments. Estimates of intrasheet dipole-dipole interactions are obtained.

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