Gemini and Libra can find a strong social affinity. They enjoy sharing friends, talking and having fun, and they tend to adapt easily to changes of setting.
That closeness can give rise to an excellent friendship. For the relationship to develop on other levels too, it helps to look at the other affinities in the synastry and to tend to intimacy and shared projects.
Both belong to the Oxygen group, traditionally air. In this approach, that combination may stay at the level of ideas and conversation if it doesn’t find the drive to make things concrete.
To explore that difference, I suggest reviewing mobility. If either has at least 23 % Hydrogen, they can bring the initiative to act; if either has at least 23 % Silicates, they can help give the plans a practical shape.
This percentage is an internal criterion of the system, explained in the text on mobility. The underlying question is who turns the shared enthusiasm into action, and how.