Taranakite is a very specific mineral, and as such, there aren't many synonyms for it. Some possible options could include "hydrated copper silicate," which describes the chemical composition of the mineral, or "blue-green mineral," which highlights its distinctive color. Other minerals with similar properties or geological formations could potentially be referred to as "cousins" of taranakite, but they would not necessarily be synonyms. Overall, while it may be difficult to find exact synonyms for taranakite, there are plenty of ways to describe its unique properties and characteristics.