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See Through Glass, Made From Metal


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Not meaning to nitpick, but although the title of the article calls it a metal, it's not.  Here's a wikipedia article about the substance:

https://en.wikipedia.org/wiki/Spinel

Roughly it's analogous to fused silica (man made lenses, windows, etc.) relationship to natural quartz -- the same chemical composition but fabricated to tight specifications (especially minimizing impurities) compared to what nature does.

 

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