Hot mess!

Based on the appearance of the rock in the image, it looks like a type of geode or vesicular basalt. Here's why:

Vesicular Basalt: The rock has a rough, porous texture with numerous cavities, which is characteristic of vesicular basalt. This type of basalt forms when lava with dissolved gases cools quickly at the surface, trapping gas bubbles as vesicles. The brown and yellowish coloration could be due to oxidation of iron within the rock.

Geode: Alternatively, it could be a grouping of crushed geodes, which are a hollow, vaguely spherical rock, often lined with crystals inside. The outer surface of your rock looks somewhat rough and earthy, which is typical for the interior of a geode before it's been cut or broken open to reveal the crystals inside.