“Grape agate” is a trade name, not an agate at all, but a botryoidal purple Chalcedony. Currently, it is being mined en masse from Mamuju Regency, West Sulawesi Province, Indonesia. Some have been mined in Green River, Utah, and possibly Pennsylvania, USA.
Grape Agate is an energetic introvert. It doesn’t yell at you in a booming voice,...