Why is anthracite coal a metamorphic rock?
The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Is anthracite coal a igneous rock?
Anthracite, unlike other coal types which are sedimentary rocks, is a metamorphic rock. It was buried so deep that no plant remains have survived.
What type rock is coal?
sedimentary rock Coal is a sedimentary rock. Coal is altered through biological and burial-thermal processes into different ranks. Many sedimentary rocks are also altered through burial-thermal processes (increasing cementation, etc.).
What class of rock is anthracite?
Answer and Explanation: Anthracite is a form of coal, and more generally is a sedimentary rock. Another name for anthracite is hard coal.
Is anthracite metamorphic?
anthracite, also called hard coal, the most highly metamorphosed form of coal.
Is anthracite coal metamorphic rock?
Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 86% and 97%. The term is applied to those varieties of coal which do not give off tarry or other hydrocarbon vapours when heated below their point of ignition.
Is anthracite a chemical sedimentary rock?
Some varieties of coal material, by increasing grades, are peat, lignite, bituminus, and anthracite. Anthracite is legitimately a metamorphic rock. 3. Coal often forms as beds between layers of other clastic sedimentary rocks, in environments such as river swamps or lakes.
Why is coal a sedimentary rock?
Being composed of carbon, coal forms a carbonaceous deposit. Having been transported and accumulated in a single deposit it is sedimentary. Having undergone metamorphosis and petrification it is a rock. Consequently it is reasonable to classify coal as a carbonaceous sedimentary rock.
Is coal an igneous rock?
Coal was not derived from molten material, so is not igneous by definition. It was not transformed under temperature and pressure from a pre-existing rock into a metamorphic rock. Coal was lithified by compressive forces from loose material at relatively low temperature.
Is coal a clastic sedimentary rock?
Coal is a non-clastic rock. Limestone is a clastic rock. Limestone formed from the remains of animals.
Is anthracite coal clastic?
Some varieties of coal material, by increasing grades, are peat, lignite, bituminus, and anthracite. Anthracite is legitimately a metamorphic rock. 3. Coal often forms as beds between layers of other clastic sedimentary rocks, in environments such as river swamps or lakes.
Is coal igneous or sedimentary?
sedimentary rock Coal is a combustible sedimentary rock formed from ancient vegetation which has been consolidated between other rock strata and transformed by the combined effects of microbial action, pressure and heat over a considerable time period. This process is commonly called 'coalification'.