Abstract
AbstractThe method of Trostel & Wynne (1940) for the estimation of free silica has been applied to the analysis of coal‐measure rocks, and its suitability critically studied. If two fusions and alkali extractions are carried out, and if corrections are applied for the quartz lost during analysis, and for the presence of resistant minerals, the analytical accuracy is ± 2% in the absence of chalcedonic silica. In its presence the result is low, since the loss of chalcedonic silica during analysis is greater than that of quartz. The method cannot be used to estimate accurately the free silica content of mixtures containing both quartz and cristobalite, since the loss from cristobalite during analysis is again greater than that from quartz.
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