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? Associated with the organic fraction, (2) generally associated with the inorganic fraction, and (3) elements that could be associated with either or both fractions.Horton and Aubrey (1950) handpicked pure vitrain samples from coals and separated the samples into five different specific gravity fractions. They then analyzed these fractions for minor elements. For the three vitrains that were studied, they concluded that beryllium, germanium, vana dium, titanium, and boron were contributed almost entirely by the inherent (organically combined) mineral matter and that manganese, phosphorus, and tin were associated with the adventitious (inorganically combined) mineral matter.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.