Which type of coal is characterized as non-anthracite?

Bituminous coal is indeed characterized as non-anthracite. It is one of the major types of coal, formed under conditions of higher pressure and temperature than lignite but not reaching the metamorphic stage of anthracite. Bituminous coal typically contains a higher carbon content than lignite and sub-bituminous coal, which contributes to its greater energy content and efficiency as a fuel source. It is commonly used in electricity generation and for making steel due to its ability to produce a high heat output.

In contrast, lignite is a younger type of coal that has a much higher moisture content and lower energy content. Sub-bituminous coal sits between lignite and bituminous coal in terms of carbon content and heating value. Anthracite, on the other hand, is the highest grade of coal with the highest carbon content and energy density, which distinguishes it from the other types mentioned. Thus, bituminous coal is effectively categorized as non-anthracite, making it the correct choice for this question.