Silica gossan as a prospective guide for amethyst geode deposits in the Ametista do Sul mining district, Paraná volcanic province, southern Brazil - ScienceDirect
Finding Large Amethyst Crystals Digging Jackson's Crossroads | Public Mine | JXR - YouTube
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What Is Amethyst Worth? Amethyst Price & Valuation - FossilEra.com
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FMF - Friends of Minerals Forum, discussion and message board :: View topic - Join us to dig a giant Amethyst geode
Amethyst: Mineral information, data and localities.
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