Volume 39, 1906
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Art. XLII.—Notes on a Coal (?) from Boby's Creek, Waipara.
[Read before the Philosophical Institute, of Canterbury, 3rd October, 1906.]
The coal or shale herein described is of especial interest inasmuch as it carried on its surface both free sulphur and calcium-sulphate, and so appeared to illustrate a definite stage in the development of such shales. The calcium-sulphate crystals appeared in the form of large and well-developed rosettes, while the sulphur was scattered in small particles throughout the fissures in the coal, but only in small quantity.
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Results of Analysis.
| Per Cent. | |
|---|---|
| Water | 8.01 |
| Volatile matter other than water | 12·45 |
| Fixed carbon | 11·45 |
| Ash | 68·13 |
| 100·04 |
| (1.) Coal. | Per Cent. |
|---|---|
| Carbon | 16·87 |
| Hydrogen | 2·42 |
| Nitrogen | 1·03 |
| Sulphur (in coal substance?) | 3·21 |
| Water | 8·01 |
| Ash (including 2 per cent. sulphur) | 68·13 |
| 99·67 | |
| (2.) Ash. | Per Cent. |
| Silica | 72·44 |
| Iron and alumina | 19·14 |
| Lime | 2·81 |
| Soda | 3·60 |
| Potash | 0·44 |
| Sulphuric acid | 2·01 |
| 100·44 | |
| (3.) Sulphur. | |
| The total sulphur as given by Eschka and Carius methods was 5·21 per cent. By boiling the powdered coal with much water 2 per cent. of sulphur was extracted, and the ash of the extracted coal contained only traces of sulphur. |