You find a rock and are trying to determine if it is igneous…

You find a rock and are trying to determine if it is igneous, sedimentary, or metamorphic. What is one thing you might look for as you develop a hypothesis for what type of rock it is? Explain your reasoning. Note: There are several ways to answer this question and I’m not looking for any specific answer. You should be able to answer this question in one to two sentences.