mildew, stain, mineral?

F

fuss

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Jul 27, 2018
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Wisconsin
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This stone I found on the shoreline of Lake MI (WI side) has a pretty cool looking pattern on it and after looking a bit closer at it, it resembles either a fungus or plant like impression/stains. Any thoughts? Thx.

odd pattern small size.jpg

odd pattern2 small size.jpg
 

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DDancer

DDancer

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Mar 25, 2014
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Traveling US to work
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Dentritic crystals. Likely manganese.
 

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Found this mineral last year and was hoping somebody could help identify it

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