Don't know really what to call this material. Was told gem sillica, but while there surely are sections of the material justifying that title, I rather call is Gem Silica in Chrysocola.
After today
This is so much harder to do than the last one. The water-flow needs to work optically, otherwise that will never look right. Then comes the fish: I got no idea yet as to how deep I need to cut to allow the creature to be seen. So there is lots of experimenting ahead.
Two surprises already observed: contrary to the usual; sanding increases the color-strenght, and the dark blue/black on top might turn into purple/red.
