Carnelean!

This rock appears to be a type of mineral known as Carnelian. Carnelian is a variety of chalcedony, which is a cryptocrystalline form of silica. It is typically characterized by its rich, reddish-brown color, which matches the appearance of the rock in your photo. Carnelian often has a waxy luster and can sometimes show banding or inclusions, which also seem to be present in this specimen.