| Materials | Flaw type | Flaw number |
| Natural rocks | Granite | Open | 1 [3, 8, 41], 2 [8, 12, 42], 3 [43] | Sandstone | Closed | 2 [44] | Open | 1 [3], 2 [45], 3 [46] | Marble | Open | 1 [13, 47, 48], 2 [49] |
| Rock-like materials | Cement mortar | Closed | Multiple [50, 51] | Open | 1 [52, 53], 2 [11, 54, 55], 3 [11], multiple [56, 57] | PMMA | Closed | 1 [8], 2 [8] | Open | 1 [8], 2 [8, 58, 59] | Gypsum | Closed | 1 [10, 13, 47], 2 [48, 60], 3 [60], multiple [60] | Open | 1 [10, 18, 47, 61], 2 [47, 60, 61], 3 [58, 60ā62], multiple [60, 62] |
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