This specimen comes from a new find of chalcedony from Indonesia and REALLY reminds me of a cluster of purple grapes. It is quite striking in my humble mineralogical opinion. It consists of an aggregation of purple, circular chalcedony xls to about 3-4 mm. Intact with a few partial xls, only visible under magnification. I really like these specimens and I find them quite unique and very attractive, while affordable.  Enjoy!