Coal is an organic sedimentary rock belonging to the biochemical subclass. It is primarily composed of carbon, hydrogen, and oxygen, with various impurities such as …

Lignite, also known as “brown coal,” is a soft, brownish-black sedimentary rock that belongs to the class of organic-rich rocks called coal. It is a …

Diatomite, also known as diatomaceous earth, is a sedimentary rock composed primarily of the fossilized remains of diatoms, single-celled aquatic algae. These microscopic organisms have …

Asphaltite is a dense, solid form of hydrocarbon, which falls under the category of sedimentary rocks. It is a sub-class of bitumen, a naturally occurring, …