0c0c5f5c_ence_terms___Australian_Museum__Definition
[Term] Gangue: [Definition] 
part of a mineral deposit from which a metal or metals are not extracted. It is important to note that gangue minerals in one mineral deposit may be ore minerals in another (e.g. pyrite, baryte, fluorite). The most common gangue minerals are quartz, calcite, fluorite, siderite and calcite
Glossary of geoscience terms - Australian Museum
Definition