Ametista do Sul, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil

"The world's amethyst capital".
The genesis of amethyst geodes in basalts (Serra Geral Formation) at Ametista do Sul, Brazil, is considered as a two-stage process with an early magmatic protogeode formation and a late, low temperature infill of the cavity.
Mineralium Deposita (2003) 38 (8), 1009-1025

Mineral List:

	Calcite

	Celadonite

	'Chalcedony var: Agate'

	Gypsum

	Quartz var: Amethyst

5 entries listed. 3 valid minerals.

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