Abstract: A shaft is rotatably supported on both the ends of the housing. The housing has an inlet for charging discarded glass articles and an outlet for discharging glass fragments. Crushing bars are mounted on the shaft and arranged from near the inlet toward the neighborhood of outlet of the housing. The glass articles charged through the inlet into the housing are kicked by the crushing bars toward the inner surface of the housing and broken into fragments while being rebounded on the inner surface of the housing. The glass fragments dropped down onto the bottom of the housing are agitated, by poking bars mounted on the shaft in the neighborhood of the outlet, while being subjected to impact forces, to permit them to be reduced to substantially rounded gem-like granules.