Hard wax which is obtained by solvent extraction of certain types of lignite or brown coal is known as:

Carnauba wax is often replaced in part by certain synthetic waxes that are compatible with paraffin wax. At least two waxes of this type can be used. One is a complex nitrogen derivative of the higher fatty acids and the other contains esters of acids derived from montan wax, a derivative hard wax that is obtained by solvent extraction of certain types of lignite or brown coal. Approximately a third of all montan wax produced is used in automobile polishing pastes. Key Concept Montan wax, also known as lignite wax or OP wax, is a hard wax obtained by solvent extraction of certain types of lignite or brown coal. Phillip’s 12th edition page 196