This attractive chalcedony is from the Mamuju area, Weat Sulawesi Province, Indonesia. This material which is a fairly recent find (2016) is from a series of deposits from a beach at Pantai Ngalo. The trade name for this material is “Grape Agate”. The deposits contain a handful of other minerals but the chalcedony is the variety much sort after. The chalcedony is also said to actually be a botryoidal form of amethyst. It can be found in colors varying from neutral hues to greens and purples. This piece has the attractive purple colored clusters or grape-like crystalline formations. This piece measures 3 1/4 x 2 x 1 inches or 82 x 50 x 25 mm.