Salt grinder or shredder, shreds
Hard, brittle object being broken, crushed and crumbled x3
Toast crumbled onto a tray
A slice of dry toast being broken - snapping crumble.
Creaks and squeaks of celery being handled.
Crunching, crushing and crumbling of sugary crystals. Continuous pour with crunchy movement.
Rattling and rustling a plastic bag.