spalling

The process of reducing (stone blocks, etc.) to an approximately level surface by hammering.

In the British-made Greek bricks the magma is not so evenly distributed, but after successive spallings the brick is converted bit by bit into the larger crystal formation […]

Any process that spalls a surface, or the damage that results from that process: spallation.

He says: "If we'd left any cracks exposed then it could have resulted in spalling.

A fragment or chip of stone.

A third process fluid, water, is employed to cool the burner and to aid in the removal of spallings.