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Found on Lake Superior in Grand Marais, MN


SaintSakuraMN

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Found several of these on a beach in Grand Marais, MN on Lake Superior. The light colored part is a bit rougher feeling and the red/maroon knobs or nodules are quite hard and smooth and raised. I can’t find anything on them…someone mentioned in another forum possibly Rapakivi Granite or Granite Mica Schist but I think they seem a bit different than the images I saw of those. The largest one has a few tiny pockets of crystals. Thoughts?

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First of all, these are not fossils, so although you probably already know that, you should have posted under "Rocks & Minerals", but never mind. I think it's possible that the red nodules might be worn garnet, making the stones an extremely eroded metamorphic garnet mica schist.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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TOPIC MOVED TO ROCKS AND MINERALS.  ;)

    Tim    -  VETERAN SHALE SPLITTER

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"In every walk with nature one receives far more than he seeks."

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I think they are taconite pellets, bleached by exposure to sun and surf. A lot of them in that area missed the bin while loading the freighters and have washed up on area beaches.

  • I found this Informative 1

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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