Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Representative chemical compositions of the STNR hydromagnesite
| Analysis number | 2 | 18 | 24 | 26 | 30 | 31 | 32 | 35 | 39 | 34 | Average n = 10 | SD |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| wt% | ||||||||||||
| SO3 | 1.31 | 1.80 | 1.38 | 4.98 | 2.57 | 1.59 | 1.52 | 1.56 | 1.14 | 1.34 | 1.92 | 1.14 |
| P2O5 | 0.00 | 0.00 | 0.00 | 0.00 | 0.04 | 0.00 | 0.01 | 0.01 | 0.02 | 0.00 | 0.01 | 0.01 |
| SiO2 | 0.22 | 0.29 | 0.22 | 0.24 | 0.16 | 0.14 | 0.18 | 0.16 | 0.25 | 0.25 | 0.21 | 0.05 |
| Al2O3 | 0.13 | 0.07 | 0.00 | 0.02 | 0.00 | 0.00 | 0.00 | 0.09 | 0.08 | 0.06 | 0.05 | 0.05 |
| PbO | 0.01 | 0.00 | 0.00 | 0.03 | 0.00 | 0.00 | 0.02 | 0.04 | 0.05 | 0.00 | 0.01 | 0.02 |
| ZnO | 0.02 | 0.00 | 0.00 | 0.02 | 0.00 | 0.01 | 0.00 | 0.02 | 0.03 | 0.00 | 0.01 | 0.01 |
| SrO | 0.01 | 0.03 | 0.07 | 0.05 | 0.08 | 0.02 | 0.02 | 0.00 | 0.02 | 0.03 | 0.03 | 0.03 |
| MnO | 0.01 | 0.00 | 0.02 | 0.00 | 0.02 | 0.00 | 0.01 | 0.00 | 0.00 | 0.01 | 0.01 | 0.01 |
| FeO | 0.04 | 0.00 | 0.00 | 0.01 | 0.00 | 0.03 | 0.00 | 0.03 | 0.00 | 0.00 | 0.01 | 0.01 |
| CaO | 0.11 | 0.08 | 0.08 | 0.13 | 0.06 | 0.07 | 0.07 | 0.13 | 0.11 | 0.08 | 0.09 | 0.03 |
| BaO | 0.00 | 0.00 | 0.00 | 0.02 | 0.00 | 0.02 | 0.01 | 0.00 | 0.02 | 0.02 | 0.01 | 0.01 |
| MgO | 41.77 | 43.29 | 40.65 | 39.74 | 41.09 | 41.38 | 43.65 | 40.15 | 42.33 | 38.80 | 41.28 | 1.53 |
| Na2O | 0.00 | 0.00 | 0.05 | 0.03 | 0.05 | 0.06 | 0.07 | 0.03 | 0.01 | 0.03 | 0.03 | 0.02 |
| K2O | 0.04 | 0.06 | 0.07 | 0.07 | 0.05 | 0.04 | 0.07 | 0.01 | 0.00 | 0.01 | 0.04 | 0.03 |
| Total-1 | 43.66 | 45.61 | 42.54 | 45.33 | 44.11 | 43.36 | 45.62 | 42.25 | 44.06 | 40.62 | 43.72 | 1.61 |
| MgO | 41.77 | 43.29 | 40.65 | 39.74 | 41.09 | 41.38 | 43.65 | 40.15 | 42.33 | 38.80 | 41.28 | 1.53 |
| CO2* | 36.48 | 37.81 | 35.50 | 34.71 | 35.89 | 36.15 | 38.12 | 35.08 | 36.97 | 33.89 | 36.06 | 1.34 |
| H2O** | 21.76 | 18.90 | 23.85 | 25.55 | 23.02 | 22.47 | 18.23 | 24.77 | 20.70 | 27.31 | 22.66 | 2.86 |
| Total-2 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | |
| Apfu or mpfu [five cations basis] | ||||||||||||
| Mg2+ | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 | |
| (CO3)2−*** | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | 4.00 | |
| OH−*** | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | |
| H2O**** | 4.83 | 3.89 | 5.57 | 6.20 | 5.27 | 5.08 | 3.68 | 5.91 | 4.47 | 6.88 | 5.14 | 1.01 |
| Unit-cell parameters | ||||||||||||
| a[Å] | b[Å] | c[Å] | β[°] | V[Å3] | ||||||||
| 10.050(8) | 8.921 (7) | 8.384 (6) | 114.291 (25) | 685.06 | ||||||||