| Sample ID | Mineral compositions | ko | Φ | F | α∞ |
1 | Sample 1 | Silica, Alumina, Ferric Oxide, Ferrous Oxide (https://www.bereasandstonecores.com/) | 310 | 20.1 | 14.5 | 2.9 |
2 | Sample 2 | Alumina and fused silica (see: http://www.tech-ceramics.co.uk/) | 430 | 44.1 | 5.0 | 2.0 |