This is one of the oddest things I have ever posted on this website-- a pseudomorph of some type of phosphate (whitlockite?) after what is most likely vivianite, perched on a stalactite of more phosphate mateiral.
This comes with a colelctor label stating that it was purchased in Curacao in 1980.
How often do you see a specimen from Curacao? Or anywhere in the Caribbean, for that matter?