1. 
   maceral
   any of the numerous microscopically recognizable, individual organic constituents of coal with characteristic physical and chemical properties. ... [3 related articles]
   Found op http://www.britannica.com/eb/a-z/m/3
   
   
2. 
   Maceral
   A maceral is a component, organic in origin, of coal or oil shale. The term `maceral` in reference to coal is analogous to the use of the term `mineral` in reference to igneous or metamorphic rocks. Examples of macerals are inertinite, vitrinite and liptinite. == Inertinite == Inertinite is conside...
   Found op http://en.wikipedia.org/wiki/Maceral
   
   

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