What's it like to have Mars in Gemini?

unknown but I do have Gemini in 8th house....

Mars represents how we act when we want something. So it is how we respond to want, how we take action, what kind of initiative we have, how assertive we are, and if we are blocked or thwarted with, Mars indicates how angry or aggressive we might get.

The person will handle all these types of behaviors in the style of Gemini, but whether or not this is the positive side of Gemini or the negative side of Gemini, depends on how Mars "aspects" any of the other planets in their birthchart (in other words, whether or not the Mars needs supports or conflicts with other inner needs).

We NEVER interpret the sign that a planet is in, until we know how it interacts with the other parts of our personality (other planets).

Sometimes there are only harmonious aspects, sometimes there are only discordant aspects, and sometimes there are a mix of both.

Mars badly-aspected is short-tempered, easily irritated, but doesn't hold onto their anger. Their anger will be mostly verbal. They may have trouble completing what they start, and what they want may change without warning.

Mars well-aspected will get irritated but uses inner reason and logic to calm down quickly. Again, it will be mostly verbal anger. They often have many projects on the go, because they have a wide range of interests and are eager to learn about many things. They are flexible and can handle all these various interests and goals.

FIRST you have to look at how their Mars aspects other planets in t