The Paraná volcanic province is the world's largest producer of amethyst geodes, mostly
from the Ametista do Sul mining district (20 by 30km) in southern Brazil. The description of …

Large amounts of stone wastes are accumulated alongside different exploiting mines of
amethyst geodes in south Brazil, which are becoming an unsustainable environmental …

The Tevinskoye agate deposit is located in the North of the Kamchatka peninsula (Russia)
and represented by agate-bearing Eocene basaltic and andesitic rocks of the Kinkilsk …

Variable intensity of hydrothermal alteration of the Veia Alta basalt flow, Ametista do Sul,
Brazil, exerted the fundamental control on the shape and size of the amethyst geodes. The …

The amethyst and agate geodes from the Los Catalanes Gemmological District in Uruguay
represent one of the main deposits of its kind worldwide. The geometry of the deposit is …

The “passiveness” of passive continental margins across the globe is currently under debate
since several studies have shown that these margins may experience a variety of stress …

Abstract The Catalán Flow in the southernmost Paraná Volcanic Province exhibits two
extensive red and gray to white tiers and an areally vast breccia stockwork, both of which are …

The Cretaceous interaction of the heated, giant Guarani aquifer with lavas, dikes and sills of
the Paraná volcanic province is here evaluated based on the description of the large …

Natural material is the classification given to those retrieved from nature, whether of plant,
animal, or mineral origin. Essentially, after extraction, they are characterized by requiring …

Rings and arcs in a Paraná Volcanic Province quartz andesite were formed by distal imprint
of design of the top of barchan and linear dunes. Hydrothermal jetting occurred in the Lower …