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

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What is this weird mess I found in my backyard? Black circles are shiny like glass. : r/whatsthisrock

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

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

Shiny, black, layered rock found under clay in yard - Augusta, Georgia area. Lightweight, flakes when struck. : r/whatsthisrock

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