The photofragmentation spectra of ${{\mathrm{Si}}_n}^{+}$ for $n=2\mathrm{} \mathrm{to} 12$ have been obtained in an apparatus that produces, isolates, and fragments ionic clusters on a mass-resolved basis. The most prominent species are found to be ${\mathrm{Si}}_6^{+}$ and ${\mathrm{Si}}_{10}^{+}$. The fragmentation data are shown to be consistent with a microcrystal model of cluster geometry for ${{\mathrm{Si}}_n}^{+}$.

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