Definition: The word "anthracoid" appears to be a mineral, primarily associated with coal. It is commonly known as an iron oxide that occurs in certain types of coal deposits. The specific type of iron oxide varies by source, but it's typically composed of iron and other elements. The definition of "anthracoid" includes: - A metallic substance formed when iron (iron oxide) combines with sulfur. - Sometimes used to describe a type of coal where iron is present in significant proportions. - Also known as anthracite, it has a brown or yellow color due to the iron oxides it contains. This material's name is not specific to one particular geographical location but rather serves as an identifier for various types of coal.
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