GLASS FACTS by Glass & Art

GLASS FACTS by Glass & Art

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It happened to me at least three times: a very enthusiastic sales(wo)man offering me something special. Pieces that looked like stone, and could be smashed to a frit. This frit  could be melted into the beads. One of these salespersons said (when seeing my suspicious look): "sometimes it is also called aventurine, a real gemstone! This is one of the few stones that can be melted together with glass!"

I did not believe this story, for the very simple fact that if you melt COE 90 with COE 96 (two different brands of glass) together, it will just break. How then can nature create a stone that comes with different COE's to fit the distinct brands of glass? For different types of glass you can buy different kinds of goldstone or aventurine now, in several different colors  (brown, green, bleu, and black are common). Nature keeps inventing?

So I went out to investigate, and I am sorry to disappoint you, but goldstone is just ordinary man-made glass, with a special twist. Stories differ. Some claim that it is invented by the seventeenth-century  Venetian Miotti family for the Doge. Others claim it is invented by a monk in a monastery to make gemstones. Whoever is right, "goldstone" is ordinary glass with copper in it. If you will try to mix copper powder and glass at home, you will find that the copper oxidizes, turning into a none-shiny green-bleu-black.  Sparkling copper in the glass can only be made in a very oxygen-low environment, causing the copper to crystallize in the glass: a quite special chemical reaction!