What are these shiny black rocks? They almost look like glass. Bonus feline formation. : r/whatsthisrock

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Shiny black rock. : r/whatsthisrock

What are these shiny black rocks? They almost look like glass

I found some black glassy rocks in Lake Michigan, can anyone help

How about this for you rock hounds, have you ever seen obsidian

*UPDATE* Big shiny metallic rock is strongly attracted to magnets. I

Found tons of this black rock on the banks of the peace river in

Rock Identification Guide

How to tell the Difference between Black Onyx, Jet, Apache Tear

How to tell the Difference between Black Onyx, Jet, Apache Tear

How about this for you rock hounds, have you ever seen obsidian