Ringel ore, also known as cockade ore, is a local specialty. In addition to the ore from which it gets its name, its mineralogical components are: galena, sphalerite, quartz and calcite. An ore is a rock that contains an economically recoverable concentration of a specific mineral. After the extraction of the ore, the mineral (for example a certain metal or mineral) must be extracted from the ore, after which an economically worthless residue remains, gangue or gangue. Ores of a particular metal are often enriched in ore minerals, minerals that form a bond between the metal and one or more other elements. Examples are minerals such as galena (PbS, lead ore), sphalerite (ZnS, zinc ore), hematite (Fe2O3, iron ore), or chalcopyrite (CuFeS2, copper ore). Minerals used for other purposes, such as apatite (Ca5(PO4)3F, phosphorus production) or quartz (SiO2, glass manufacture) are industrial minerals. However, gold usually occurs in unbound form in gold ore. The distinction between ore minerals and industrial minerals is not always strictly enforced. Many ores contain more than one economically interesting metal in usually several minerals. For example, galenite and sphalerite often occur together, as do copper and nickel (chalcopyrite and pentlandite, (Ni,Fe)9S8), or copper and iron (in chalcopyrite). It is not always economically possible to extract all those metals. Also, ores usually also contain minerals of no economic value, such as silicates (e.g. quartz) or carbonates (e.g. calcite). Sometimes ores consist largely of a single mineral, and sometimes the name of the mineral is used to refer to the ore. For example, one speaks of bauxite instead of aluminum ore.