maceral component

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Maceral — A maceral is a component 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.… … Wikipedia
Vitrinite — is one of the primary components of coals and most sedimentary kerogens. Vitrinite is a type of maceral, where macerals are organic components of coal analogous to the minerals of rocks. Vitrinite has a shiny appearance resembling glass… … Wikipedia
feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… … Universalium

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