Abstract
AbstractIt has been found that the ashes of certain brands of vitrain interbedded with Coal Measure rocks in North Staffordshire and North Wales contain notable quantities of some of the less common elements, chiefly vanadium, chromium, titanium, and nickel. “ Cauldron “ vitrains from the Durham coalfield and Whitby jet show the same phenomenon, which appears to be fairly general for carbonaceous material of a black, brittle, lustrous type occurring in isolated bands or lumps in rocks. It is considered that current theories of the origin of rare elements ‐in coals cannot account satisfactorily for concentrations such as arc now reported. In addition, small but determinable quantities of copper, boron, lead, germanium and strontium have been found in certain coal scams; these occurrences were in some cases traced to the presence of distinct mineral species, such as copper pyrites and galena.
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