Cinnabar Agate!

The rock in the image appears to be a polished agate, specifically a type known as "Chicken Blood Stone" or "Cinnabar Agate." This variety is characterized by its bright red to orange inclusions, which are typically due to the presence of cinnabar, an ore of mercury. The base color is often a white, gray, or light-colored agate, providing a striking contrast to the vibrant red inclusions. These stones are often polished into cabochons or other ornamental shapes for use in jewelry or as decorative items.