I’ll be checking back here occasionally for the posted pic.
I just tried a Google search for "transparent aluminum" and the pic I was referring to popped right up.
http://www.rense.com/general20/transparentalum.htm
Some sources refer to it as "transparent alumina", a ceramic oxide made from finely powdered aluminum subjected to intense heat. Perhaps some metallurgists here can explain the distinction between this and what is being described in the new article.