Mined in the Mamuju area, Sulawesi Barat Province, Indonesia.
Nicknamed Grape Agate, this is a type of Amethyst that grows in a botryoidal fashion. Grape agate is a marketing name for purple aggregates of tiny quartz crystals with a spherical (botryoidal) habit. The name reflects their purple color and how they occur in clusters that resemble bunches of grapes.
