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June 25, 2011

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Beautiful drawings of interesting grains and intriguing background info as well. Thanks for sharing!

I have a potential ID for grain #3. A fulgurite: that's sand melted from a lighting strike. The May/June issue of Rock and Mineral magazine has an article with background and images of fulgurites found in upstate New York. Photos show numerous teardrop grains with a handle. I also inspected a collection of fulgurites from a lightning strike in on a farm field in northern Minnesota a couple of weeks ago and amid that collection were numerous nodules with the filaments too. I've also seen some fulgurites from the quartz sand beaches of Lake Michigan and those were clear whereas those from northern Minnesota and those imaged in the article are greenish in color.

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