Thanks again for your help, Johnphillip, much appreciated!
Do you think the green is a result of a reaction between the copper in the
aventurine and another ingredient in the glass mass? I´ve also tried to find
a link to Nason in order to contact them directly - obviously I´m a bit thick
and didn´t succeed.
Nor did I with trying to make out the colour of the black glass. I´ll possibly
have to wait until the next sunny day, which I´m optimistically expecting
for next June.