Grape Agate is a relatively new find. Although the trade name is Grape Agate, these are actually Botryoidal Purple Chalcedony Manakarra stone is a native rock from Sulawesi Island, Indonesia. It is a Botryoidal Chalcedony that looks like a bunch of grapes. The name of Manakarra is taken from the province in Western Sulawesi. It is also known as Grape Agate and comes in purple, blue and green colors.