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Identity HelpCan someone identify this please?

29th Aug 2014 16:56 UTCDerek

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Copyright © mindat.org
I found this rock on a Lake Superior beach in the Upper Peninsula of Michigan. It is the size of a cork from a bottle and very light-weight. It is very smooth and is turquoise-blue, white, and brown striped. I have no idea what it could be, can someone tell me?

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29th Aug 2014 21:23 UTCSteve Federico

Derek,it looks like glass,slag or even paint from auto plant's.I have a number of good books on Lake Superior rocks you can get cheap online.Lot's of photos etc. in them...........Steve

29th Aug 2014 23:08 UTCDerek

Thanks! I will definitely look into getting some books online!

30th Aug 2014 00:46 UTCPaul Brandes 🌟 Manager

These are not glass slag or from auto paint!

They appear to be water worn pieces of rhyolite from the Keweenaw Peninsula.

Where have been finding the rocks in your posts, Derek (near what city or in what county)?

30th Aug 2014 02:36 UTCryan christensen

You nailed it, its a rock;)

30th Aug 2014 03:37 UTCBill Cordua 🌟 Manager

Hi Derek - Rhyolite - particularly a silicified rhyolitic welded tuff is a good possibility. It could also be a silicified mudstone or other fine sediment with a bit of "soft sediment deformation" - slumping when it was soft muck on the sea floor. Whatever It is a pretty interesting rock. Are you near enough to Michigan Tech or other U with some geologists you could take this to?

30th Aug 2014 16:27 UTCSusan Robinson

I agree with Bill and Paul - banded rhyolite.
 
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