I don't recognize it as a naturally occurring mineral.
It looks like man-made copper sulphate (CuSO4), doctored somewhat to loook a bit more natural.
Copper sulphate has a platy habit, so is suited to ocurrence in cockscomb / desert rose arrangements, as you'll see if you do a Google image search
You may find this site on fake minerals interesting
Find the photo of chalcanthite (a hydrated copper sulphate); it occurs as both natural and man-made specimens. The name means 'copper flower'.
Thankyou for the help I seem to have been duped although I still think it is an interesting mineral and worth the purchase. Luckily it has happened to me pretty early in my collecting 'career' so I owe you many thanks.
When collecting minerals, one obviousy hankers after bigger and better specimens, so it is easy to be swayed by fakes. However, even fakes can have beauty and value (as with copies of paintings, man-made versus natural pearls, etc.). Just try to make sure you pay a price commensurate with the nature of the goods.