Lava Spud!

The rock in the image appears to be a type of volcanic rock known as #scoria. Scoria is characterized by its numerous macroscopic ellipsoidal vesicles, which are holes or cavities within the rock formed by the escape of gas during the cooling of lava. Here's a brief overview:

Type: Volcanic Rock (Igneous)

Composition: Basaltic, sometimes andesitic

Texture: Vesicular (full of small cavities)

Color: Typically dark, ranging from black to deep red or brown

Formation: Rapid cooling of basaltic lava, trapping gas bubbles

Uses: Sometimes used in construction, as lightweight aggregate, or in landscaping

The vesicles in scoria are a result of trapped gases that couldn't escape during the rapid cooling of lava, which is typical for volcanic eruptions. If you find this rock interesting, examining it with a magnifying glass or under a microscope could reveal even more about its structure and possibly its origins. If you're into geology or rock collecting, scoria makes for a fascinating example of how geological processes can create such distinctive textures.