The toughness of a stone is determined by the impact test using an impact testing machine. Here, a stone specimen of 25 mm diameter and 25 mm height is placed on the machine. A steel hammer of 2 kg weight is allowed to fall down axially on the cylinder from 1 cm height for the first blow, 2 cm height for the second blow, 3 cm height for the third blow and so on. The blow at which the specimen breaks is noted, which is the Toughness Index of the stone.
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