Steam Coal – Pearson Coal Petrography
Steam coals cover a broad range of coal ranks, calorific values, and geological ages, as shown in the graph below (Figure 1), Fig. (1) Calorific Value Versus Vitrinite Reflectance which is a compilation plot of about 470 individual coals, of wide geographic- and age-distribution from the United States, plotted in terms of their random Vitrinite ...
