Place your Corundum Clusters in a straight line. Dig a trench in front of them and fill it with flowing water leading to a hopper.
Mine the surrounding stone to create a room. Leave the bottom-most "Cluster" blocks intact. quark corundum farm
Place an Observer on top of the piston, facing the crystal path. Place your Corundum Clusters in a straight line
When the Corundum grows to the height of the Observer (3 blocks high), the Observer sends a signal, the Piston fires, and the Corundum is broken and pushed into the water stream. Pro Tips for Maximum Efficiency 1. Use Silk Touch the Observer sends a signal