Figure 3 shows the relation between grain density and volume fraction of organic matter for six oil shales (Torbanite, Posidonia, Messel, Himmetoglu and Condor) studied by Eseme et al.
Some of the more colorful names that have been used include cannel coal, boghead coal, alum shale, stellarite, albertite, kerosene shale, bituminite, gas coal, algal coal, wollongite, schistes bitumineux, torbanite, kukersite, and others.
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