Learn about Chalcedony
microcrystalline quartz with agate, jasper, chrysoprase; waxy to glassy surfaces, banding and botryoidal forms, a colorful, collectible spectrum.Chalcedony from Mamuju Regency, Indonesia
Mamuju Regency, Indonesia — site of grape agate chalcedony, lavender to violet botryoidal spheres that are amethystine quartz, famed among collectors.Mamuju Regency
A collector's guide to Mamuju Regency, Indonesia: its geology, mining history and notable minerals, illustrated with the 53 specimens documented from this locality on EarthWonders.
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