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

Rock Identification Guide

Michigan Man Discovers Strange Glowing Rocks In The Upper Peninsula

The Spectacular Science of the Great Lakes' Glowing Rocks - Atlas Obscura

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

Common Rocks - Time Scavengers

Found tons of this black rock on the banks of the peace river in florida. Its a little shiny, and crumbles under pressure being squeezed by hand. Any ideas what it could

Specimen Identification Guide, Public

Specimen Identification Guide, Public

What rock has a white-ish outside, white on the inside and black shiny dots? - Quora

Black shiny rock found in farmers field : r/whatsthisrock

How to Landscape With River Rock

How to Identify Black Minerals