Banded Rhyolite from Beaver, Utah. My partner and I were walking around the Tesla charging station there in January 2023 and looking at the landscaping rocks. He found one egg sized chunk of this material and I made 4 hearts out of it. He and I have the other two hearts and when this one and the other one are gone, they're gone! I know it looks like petrified wood or the bands of an agate, but it's naturally banded rhyolite. It may darken up as it absorbs your body oils from being touched.