I’m 80% sure it’s petrified wood if not rhyolite.

The product is a piece of petrified wood from Colorado's Rio Grande County, featuring a unique botryoidal shape. This unpolished fossil wood is a collectible item that showcases the beauty and history of ancient vegetation turned into stone over millions of years. Perfect for collectors or enthusiasts of rocks, fossils, and minerals, this piece offers a glimpse into the past and the natural processes that shaped our world.