* Red sandstone: This is a very common rock in Arizona, especially in the Sedona area. It gets its red color from iron oxide (rust).
* Red granite: This is a type of igneous rock that can be found in the mountains of Arizona. It often has a reddish hue due to the presence of iron.
* Red shale: This is a sedimentary rock that can be found in various locations across Arizona. It often has a reddish-brown color due to the presence of iron oxide.
* Red jasper: This is a type of chalcedony that can be found in various parts of Arizona, including the Grand Canyon. It has a red color due to the presence of iron oxide.
To be more specific, you'd need to provide more details about the rock you're thinking of, such as:
* Location: Where did you find the rock?
* Appearance: What is the rock's texture and shape like?
* Any other distinguishing characteristics: Does it have any other colors or patterns?
With more information, I can help you identify the specific type of red rock you're looking for.
