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.
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.
== Etymology == In 1935, Marie Carmichael Stopes, a paleobotanist, coined the term maceral as follows: I now propose the new word "Maceral" (from the Latin macerare, to macerate) as a distinctive and comprehensive word tallying with the word "mineral". Its derivation from the Latin word to "macerate" appears to make it peculiarly applicable to coal, for whatever the original nature of the coals, they now all consist of the macerated fragments of vegetation, accumulated under water.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).