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So What is This Stuff?


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Some years back, a friend brought me some mineral he wanted me to identify. It had a pearlescent luster but I couldn't recognize it. I finally figured it out when I realized that it wasn't actually a mineral but a man made item. It was a piece of assay slag glass which had spent a century in the weather. Rain had partly dissolved the glass giving it that pearly look. Not every thing that gets picked up is actually a mineral.
A reader who is a member of another forum pm'ed me there and actually gave the correct answer in spite of the fact that this is a very difficult ID. And yes I am the mean teacher and I do cheat.

I will say what it is tomorrow (Sunday).

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