(1) Amethyst with Goethite from Rio Grande Do Sul, Brazil

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Dimensions (inches): 2.5 x 2 x 2.25

Weight: 163 grams

Locality: Rio Grande do Sul, Brazil

Goethite Crystal System: Orthorhombic

Goethite Chemical Formula: α-Fe3+O(OH)

Amethyst Crystal System: Trigonal

Amethyst Chemical Formula: SiO2