[129] See Appendix, Note II., p. 220.
[130] According to Way, different samples of drainage waters were found only to contain from .00003 to .00031 per cent.
APPENDIX TO CHAPTER VI.
NOTE I. (p. 215).
Amount of Potash in Different Minerals.
| Felspars— | |||||
| Percentage of potash. | |||||
| (a) Orthoclase | { 9.11 | 10.28 | 11.07 | 12.12 | 12.47 |
| { 13.49 | 14.35 | 15.21 | 16.7 | ||
| (b)Oligoclase | 0.50 | ||||
| (c)Labradorite | 0.33 | ||||
| Mica | { 5.61 | 6.20 | 7.23 | 8.26 | 8.95 |
| { 9.00 | 10.25 | 12.40 | 13.15 | ||
| Amphibole | 0.25 | 2.96 | |||
| Pyroxene | 0.34 | 2.48 | |||
| Leucite | 13.60 | 18.61 | |||
| Zeolites | 0.30 | 9.35 | 0.98 | 4.93 | |
| Stassfurt potash salts— | Per cent. |
| (a) Polyhallite, potassium sulphate | 28 |
| (b) Karnallite (KCl.MgCl26H20), potassium chloride | 24 to 27 |
| (c) Sylvin, pure potassium chloride. | |
| (d) Kainit (K2SO4MgSO4MgCl26H2O), potassium sulphate | 32 |
| (e) Schoenite (K2SO4, MgSO4, 6H2O), pure potassium magnesium sulphate. |
NOTE II. (p. 217).