Rock with dark fractures

love2velo

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Found this on the shore of Lake Michigan near Milwaukee. Thought the fractures were cool and curious if anyone knows what this might be.

20140622_071319.webp20140622_071308.webp
 

Huhh, missed this post. Appears to be a fractured bit of quartzite that's be polished by erosion either from the lake waters or possibly part of a glacial deposit. A cobble stone :)
 

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