“Grape Agate“, a highly botryoidal, amethystine microcrystalline-quartz (amethyst)/chalcedony from the Mamuju area (Mamudju; Manakarra), Sulawesi Barat Province (West Sulawesi Province), Sulawesi (Celebes), Indonesia. This specimen also has crystals of what appear to be stilbite. Although stilbite is not recorded on Mindat from this location, another zeolite, phillipsite, is. Joe George photo. Please follow and like us:

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