A crushing apparatus includes a substantially U-shaped spring member having a first beam portion having a first free end, a second beam portion having a second free end, and a fixed center portion. The first and second free ends are in opposed, spaced relation with each other. A first crushing mass is positioned on the first free end, and a second crushing mass is positioned on the second free end of the spring member. An exciter is configured to excite the first and second beam portions at about a common first modal frequency. When so excited, the first and second crushing masses reciprocally converge and diverge such that material positioned between the crushing masses is at least partially crushed therebetween.