I can testify to the fact that natural opals don't work! When I first heard "opals" a few months ago, I was excited cuz I have a bunch of opal cabs. Excitedly shared them with a friend who works with boro. I was so great EXCEPT that when I tried to use them, they went 'pffft' and exploded into what looked like chalk dust within the glass. Um, er, yeah, that didn't work so I sent a quick pm to my friend to let him know NOT to try to make a masterpiece with them and... too late, he found out the hard way too.
He still speaks to me though!
So, no to natural opals... trust me on this one!
cz's = soft glass = okay
cz's w/boro = NO (not compatible)
Sue
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Sue Walsh
The past is history,
The future is a mystery
and the present is a gift.
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