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CALCITE AND AMETHYST


Scalenohedric crystals and aggregates of crystals of spherical format of honey colored calcite on amethyst (approximately 180 x 130 mm), Ametista do Sul, Rio Grande do Sul. Collection of the Museu de Geociências of the Instituto de Geociências of the Universidade de São Paulo. Photograph taken by Marcelo Lerner.