Yes, Victor, thank you for bringing this up again. It is good for anyone who buys mineral specimens to take a "re-fresher" read on the subject of fakes and forgeries every couple of years.
I remember about 5 years ago seeing the Blue "Hemimorphite" clusters everywhere. No one could say for sure what they were but they had high prices on them. Like you say, unless you test them, you can't be sure. They are very pretty, but save your money and buy some Tidy Bowl instead!
I love how they treat the "Azeztulite" in this report!

With out a doubt required reading for all mineral, fossil, and rock collectors. And there's so much more than what's listed here.