Quartz

specimen number:
1115630

location:
Rio Grande do Sul, Brazil

description:
Large matrix plate with gorgeous deep purple glassy gemmy crystals of amethyst. In good condition with minimal micro-damage present.

Amethyst from Rio Grande do Sul, Brazil, occurs within the vast Serra Geral Formation, a major volcanic province formed during the Early Cretaceous period. Geologically, the amethyst deposits developed when silica-rich hydrothermal solutions filled gas cavities, known as vesicles, within extensive basalt lava flows, resulting in the creation of massive volcanic geodes lined with purple quartz crystals. Historically, commercial extraction and lapidary work in the region began to flourish in the late 19th and early 20th centuries, largely driven by European immigrants settling in areas like Ametista do Sul, transforming the district into one of the world's largest and most prolific suppliers of commercial amethyst geodes.

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