Galena is a mineral that contains lead and sulfur, and is often used in the production of lead. If you are looking for synonyms for "more galena," there are various terms you can use depending on the context. If you are referring to an increase in the quantity of galena, synonyms could include "additional galena," "extra galena," or "greater amounts of galena." However, if you are referring to a galena with a higher concentration of lead, you could use synonyms such as "richer galena," "higher-grade galena," or "more concentrated galena." Ultimately, the synonyms you choose will depend on the specific meaning you intend to convey.