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PhotosThomsonite - Thomsonite beach, Grand Marais, Cook Co., Minnesota, USA

11th Apr 2012 04:59 UTCJohn Truax

Copyright © * Unknown User *
This does not look like Thomsonite from Thomsonite beach, Grand Marais, Cook Co., Minnesota, USA. I have seen nothing like this in many searches of the lava flows at the location. The zeolites in this area are found as seam fillings and nodules in basalt and consist of radiating crystals of various zeolites, this specimen appears to be a rock.

11th Apr 2012 05:23 UTCStephanie Martin

I agree, it looks like "bird's eye" rhyolite.

11th Apr 2012 08:32 UTCDan R. Lynch

I've seen this specimen before and thought the same thing. Definitely not thomsonite. I grew up just down the highway from Grand Marais and my dad has one of the world's largest stashes of Minnesota thomsonite, so I'm pretty familiar with the stuff.

11th Apr 2012 17:23 UTCUwe Kolitsch Manager

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