Abstract
A study of the two deepest dust bands - 3 v µm water ice band and 10 v µm silicate band - in the spectra of young stellar objects and stars is presented. Using the model of silicate core-ice mantle spheroids, the restrictions on the grain shape and size are obtained. It is found that the observed dependencies between the bands' widths and their ratio may be explained if the size of dust grains $r_V \lesssim 0.35\,\rmu\hbox{m}$ where r V is radius of a sphere with the same volume as a spheroid.
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