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It is generally agreed that interstellar dust grains consist of two maincomponents, namely, silicates and graphites. Some models, like MRN model,assume these grains to be homogeneous spheres following a power law sizedistribution. This paper presents, in the framework of Mie theory, aparametrization of extinction spectrum curves of the silicates and thegraphites separately in terms of frequency and the minimum and maximum of sizesin the distribution. Analytic expressions in ultraviolet and far-ultravioletare presented for both types of grains.The values of maximum and minimum sizesfor which these equations are valid have been identified. These equations canbe useful in a number of situations involving silicate and graphite grains.

A study of frequency and size distribution dependence of extinction for astronomical silicate and graphite grains