Amethyst Slice, item 150

Amethyst Slice, item 150


Museum quality cross-section of a volcanic fumarole, containing Quartz, Amethyst and Calcite crystals. This specimen may be viewed from two sides, as demonstrated by the pictures.

21” x 14” x 5 1/4” thick. Minas Gerais, Brazil. Comes with lucite stand.

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Vents from a volcano are called fumaroles.  Gases in the vents are super-heated and crystals form on the edges, as the gases cool.  In this case, Quartz formed first, Amethyst followed in the presence of iron - thus the purple color.  Finally, Calcite accreted on a portion of the Amethyst crystals.  The other casing is brick-baked earth.