Jess45

Hello, this is my first post and I’m new. Yesterday I was outside and came across this rock? It looks weird and not sure what to make of it. I’ve tried googling but can’t find anything related. The rock is silver pewter color with glass particles. Some spots look shiny others are dry looking. I washed the rock with warm water and the rock stayed warm for a while after I was done washing it. Any help would be greatly appreciated thanks 😊