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It's an amorphous solid.
An amorphous solid is not a solid in the traditional sense, but it's certainly not a liquid. Glass has a viscosity of zero. It doesn't evaporate. It has a melting point.
I have not read your article sir, because the abstract has failed to tell me anything I don't already know.
If one wanted to be completely accurate, one could say that glass is neither a solid nor a liquid; it displays properties associated with both. It would most accurately be classified as a state between liquid and solid. I like the term amorphous solid, because it satisfies the intuitive notion that glass is solid due to the above exclusion criteria, while acknowledging that it does not form a typical lattice. What it most certainly is not is a liquid.
I thought we were done with this a while ago.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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