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Characterization of the spicule samples
| Sample description | H2O, n (moles) from TGA | I(ν2)/I(ν4) FTIR | |
| Type | ID | ||
| ACC-spicules (biogenic ACC) | Spicule-48-1 | - | 8.3 |
| Spicule-48-2 | - | - | |
| Spicule-48-3 | - | 3.3 | |
| Spicule-48-4 | 0.25 ± 0.01 | 7.3 | |
| Calcite-spicules (biogenic calcite) | Spicule-48-5 | 0.35 ± 0.01 | 7.2 |
| Spicule-48-6 | - | 5.6 | |
| Spicule-72-1 | 0.16 ± 0.02 | 2.3 | |
| Spicule-72-2 | 0.16 ± 0.02 | 4.0 | |
