mildew, stain, mineral?

[fuss]

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.

 

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[Inspector]

Cool looking stone, congrats on the find

 

[DDancer]

Dentritic crystals. Likely manganese.

 

[fuss]

Thx.

Cool looking stone, congrats on the find

 

[fuss]

Thx DDancer.

Dentritic crystals. Likely manganese.