Abstract: An apparatus for crushing frangible or friable material using a gyratory action. The crushing apparatus includes a bowl (13) having a chamber (15) for receiving material to be crushed. The chamber (15) has a central discharge opening (27) disposed at the base thereof. The discharge opening (27) defining a throat (38) having a circumferential wall (39). A pivotable crushing head (17) is disposed generally centrally within the discharge opening (27) in spaced relation to the wall of the throat (38) to define an annular nip (41) between the wall of the throat and the outer surface (37) of the head. The crushing head is centrally supported about a pivot point (B) to permit rotational and oscillatory motion of the crushing head about the pivot point. A means including a spindle (43) is provided for imparting oscillatory motion to the crushing head.