RollyGhost Posted October 18, 2023 Share Posted October 18, 2023 Does anyone know what this could be? I've searched everywhere and haven't seen anything like it. I found it on a beach off Lake Michigan. It's very porous like charcoal, but also metallic. It barely scuffs glass, but also starts to crumble under the pressure of a scratch test. It leaves no color on paper. It's roughly .45 x .6 x .8 inches and weighs 2.0 grams. Is it just charcoal from a grill that underwent some process to make it shiny? Something else? Link to comment Share on other sites More sharing options...
RollyGhost Posted October 18, 2023 Author Share Posted October 18, 2023 I suppose porous like lava rock would actually be a better description. Link to comment Share on other sites More sharing options...
Geologyhound Posted October 19, 2023 Share Posted October 19, 2023 It might be a piece of cinder or foamed slag from an industrial furnace. Factory furnaces generated a lot of waste which was dumped or used as fill material all over the place. Link to comment Share on other sites More sharing options...
RollyGhost Posted October 19, 2023 Author Share Posted October 19, 2023 I think you may be right. I found an old post from someone who found some off Lake Michigan a few years ago and someone had mentioned scoria to them. Link to comment Share on other sites More sharing options...
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