Jaw crusher, crushing plant and crushing method

A jaw crusher (100) comprising a fixed jaw and a movable jaw for forming a crushing chamber (3) therebetween which is open at the top,the fixed jaw comprising a first wear part (1) mounted thereto and the movable jaw comprising a pitman (4) and a second wear part (2) mounted thereto; wherein the crushing chamber comprises an upper section (5), a middle section (6), and a lower section (7) having equal heights (h); and the pitman is bearing-mounted to an eccentric shaft (8) and to at least one slide member (9, 9'). The at least one slide member (9, 9') is configured to slide in a direction substantially perpendicular to the vertical diagonal(10) of the crushing chamber. A method for crushing mineral material in a jaw crusher (100) or a crushing plant (200).