| Particles | Red in colour | Minerals | Birefraction |
| l8 | + | biotite | slightly; but the birefringency is masked by sombre proper-tint of the mineral |
| l11 | + | phosphorite clay, iron-rich | no |
| l14 | lightly | a brick fragment | no |
| l15 |
| calcite | + |
| l17 | yellow-red | K-aluminosilicate | no |
| l18 |
| a silica | no |
| l26 | + | K-aluminosilicate | no |
| l34 | at the top | a washing powder | no |
| l38 |
| a wax | no |
| l39 | + | hematite | no |
| l40 |
| calcium carbonate | + |
| l41 |
| quartz | no |