What are these black shiny rocks in my yard? They are about the size of a nickel : r/whatsthisrock

Mystery rocks in California: greenish-black/one with green veins, smooth, won't scratch with steel knife, both of them feel like silk, very heavy and dense. What are they? : r/whatsthisrock

Strange semi-reflective, black-silver hard sponge, found near a beach and is hard but quite light. : r/whatsthisrock

Found this shiny, rainbow black rock on NJ beach. Lightweight, marks Grey. Think it's anthracite coal. Can anyone confirm? : r/whatsthisrock

this rock found at NZ beach is silver metallic sparkley like rock light weightish compared to other rocks the same size.. when i scratched against wood it left a metalic silver chalk..

What are these black shiny rocks in my yard? They are about the

Black shiny rock found in farmers field : r/whatsthisrock

What Is This? Shiny Black Speckled Rock? : r/whatsthisrock

Identity Help : Please help me ID this rock with black mineral

Found on the beach in South Jersey, would like more info if anyone could help. On one there are gold flakes you can see. : r/whatsthisrock

What are these black shiny rocks in my yard? They are about the

Metal rock I found in my Utah backyard when I was a child. Had it shined up at a machine shop when I was young. Any ideas? : r/whatsthisrock

What are these black shiny rocks in my yard? They are about the

Bought a ton of amazing stuff at a yard sale. Will post some later when I go through it. But BIG QUESTION. Is this asbestos??? It's heavy and shiny flakes are coming off. It dawned on me it may be so I put it in a ziplock. : r/whatsthisrock