Lava Rock!

The rock in the image appears to be a type of vesicular volcanic rock, most likely **scoria** or **pumice**. Here are some characteristics that lead to this identification:
1. **Vesicular Texture**: The rock has numerous small holes or vesicles, which are typical of volcanic rocks formed when gas escapes from cooling lava.
2. **Color**: The rock shows a mix of dark and light colors, often seen in scoria which can range from black to dark brown, with lighter mineral inclusions.
3. **Density**: While it's hard to tell from the image alone, scoria is typically denser than pumice. If the rock feels lighter than expected for its size, it might be pumice; if heavier, it could be scoria.
4. **Composition**: The presence of different colored minerals suggests it could be basaltic scoria, which often has a mix of minerals like olivine, pyroxene, and plagioclase. **Scoria** generally forms from basaltic magma, whereas **pumice** is usually from more silicic magmas.
The exact type might require closer examination or analysis of its mineral content, but based on the visual characteristics, scoria seems like a strong candidate. If you have more context like where it was found or its weight, that could help refine the identification further.