👉 In the context of mineralogy and geology, a "proppage" refers to a type of sedimentary rock that is composed primarily of organic matter. These rocks are often found in areas with high levels of oil or gas exploration, as they contain deposits of petroleum or natural gas. Proppages can vary widely in size and composition, but they typically consist of a mix of sandstones, siltstones, and claystones. They are formed from the accumulation of organic matter and minerals
