Agate Cut!

This rock appears to be a type of agate, specifically a banded agate or onyx. Here's why:

Coloration and Banding: The rock shows distinct bands of color, which is characteristic of agate. The bands can be seen in various shades of white, brown, and hints of orange or yellow, which is typical for agates due to the layering of different minerals during its formation.
Translucency: Agates are known for their translucency, especially when polished or cut like in your image. The rock has a semi-translucent quality, particularly in the white and lighter areas.
Patterns: The patterns in the rock, including the banding and some moss-like or dendritic inclusions, are common in agates. These patterns form due to the slow deposition of silica in cavities within volcanic rocks or other types of rock formations.