Beautiful Colors!

This rock appears to have a translucent to semi-translucent quality with a mix of white, yellowish, and brownish hues, and it seems to have a somewhat glassy or waxy luster. Here are some possibilities for what kind of rock this could be:
1. **Chalcedony**: This is a form of silica, specifically microcrystalline quartz, which includes varieties like agate, onyx, and jasper. Chalcedony can have a wide range of colors and often appears in bands or layers. The coloration and luster in your rock suggest it could be a type of chalcedony.
2. **Agate**: If there's any banding or layering, even if subtle, the rock could be classified as agate. Agates are known for their fine grain and bright, attractive colors, often with bands or layers.
3. **Opal**: While opal is typically known for its play-of-color, common opal can lack this feature and still have a similar appearance to your rock, especially with the translucent quality and coloration. However, opal might show more of a glass-like sheen.
4. **Jasper**: Though jasper is usually more opaque, some varieties can be somewhat translucent, especially in thin sections or when polished. Jasper often comes in red, yellow, brown, or green and could fit the coloration seen here.
5. **Quartzite**: If the rock has undergone metamorphism, it could be quartzite with iron staining or other mineral inclusions giving it the coloration. Quartzite can have a similar appearance but is typically harder and more uniformly colored unless there are distinct layers or bands.
Given these options: -
**Chalcedony or Agate** seem the most fitting due to the translucent nature, coloration, and the waxy to vitreous luster. The rock's appearance leans towards being a variety of quartz, particularly chalcedony or agate, based on its visual characteristics.