Enormous basaltic formation that covers a big zone of the Misiones province in Argentina, part of Uruguay (artigas department), part of south Brazil and Paraguay. This formation has bubbles (geodes) of quartz (some with Calcite) such as Amethyst, Citrine, agates, etc. Wanda mine is one of the several extractions of the zone.
Mineral List:6 entries listed. 2 valid minerals.
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