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.
Results of Analysis.
|Volatile matter other than water||12·45|
|(1.) Coal.||Per Cent.|
|Sulphur (in coal substance?)||3·21|
|Ash (including 2 per cent. sulphur)||68·13|
|(2.) Ash.||Per Cent.|
|Iron and alumina||19·14|
|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.|