Mode I fracture toughness (KIC) of three crystalline marbles with the same mineralogy but different grain size distributions are measured using both Cracked Chevron-Notched Brazilian Disc (CCNBD) and Hollow Centre Cracked Disc (HCCD) specimens. For each marble, KIC values obtained from both CCNBD and HCCD specimens are well fitted. Measured KIC values are negatively correlated with grain size while are correlated with measured P-wave velocity (Vp).

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