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Excerpt from Abundance of Trace and Minor Elements in Organic and Mineral Fractions of CoalNicholls (l968) plotted the concentration of an element in coal or in coal ash against the ash content of the coal. Diagrams depicting a number of such points for a single coal seam, or for a group of coal seams in a single geographic area, were interpreted for degree of inor anic or organic affinity of the element. Nicholls described elements as (l? Ass...

Excerpt from Abundance of Trace and Minor Elements in Organic and Mineral Fractions of CoalNicholls (l968) plotted the concentration of an element in coal or in coal ash against the ash content of the coal. Diagrams depicting a number of such points for a single coal seam, or for a group of coal seams in a single geographic area, were interpreted for degree of inor anic or organic affinity of the element. Nicholls described elements as (l? Ass...