Abstract: A rock and ore pulverizer or crusher device having a generally cylindrical elongate mortar defining a crushing chamber. The mortar is rockable or oscillable by means of a cradle which is driven through an eccentric drive apparatus. A generally cylindrical elongate pestle is secured within the mortar and independently retained therein by a flexible cable and swivel arrangement. The head end of the pestle is preferably tapered and provided with grooves to retain the material fed into the device. The entire device is installed at a desired inclination and material is introduced into a feed trough ahead of the pestle to be crushed as the material moves along the pestle and relative motion is imparted between.