Metamorphic rocks are sedimentary or igneous rocks that have been remodeled by strain, heat, or maybe the intrusion of fluids. You will find a list of certain aspects (activators) which can be A vital Portion of a crystal composition or just an impurity. Fluorescent minerals combined with other rock-forming minerals https://www.generationgenius.com/videolessons/rocks-and-minerals-video-for-kids/