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We compiled the polarimetric data for a sample of lines of sight with knownabundances of Mg, Si, and Fe. We correlated the degree of interstellarpolarization $P$ and polarization efficiency (the ratio of $P$ to the colourexcess $E(B-V)$ or extinction $A_V$) with dust phase abundances. We detect ananticorrelation between $P$ and the dust phase abundance of iron in nonsilicate - containing grains $< [\rm Fe(rest)/H > ]_\rm d$, a correlationbetween $P$ and the abundance of Si, and no correlation between $P/E(B-V)$ or$P/A_V$ and dust phase abundances. These findings can be explained if mainlythe silicate grains aligned by the radiative mechanism are responsible for theobserved interstellar linear polarization.

Interstellar polarization and grain alignment: the role of iron and silicon