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An amethyst geode from Uruguay with a prominent honey-yellow calcite twin crystal. It protrudes from the interior of the geode like a central plinth element.
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An amethyst geode from Uruguay with a prominent honey-yellow calcite twin crystal. It protrudes from the interior of the geode like a central plinth element.
Calcite twins form when two crystal axes grow from a common root point along different axes. They mirror each other on a common plane of symmetry. This growth habit is a rare mineralization specialty.
The amethyst geode itself shows the uniform violet coloration typical of Uruguayan material, with a light agate rim. The tips are fine and densely distributed.
What makes this geode special is the combination of amethyst and calcite twin: two mineral growth forms in one geode. The calcite crystallized as a later phase from residual solutions, after the amethyst growth.
The warm honey tone of the calcite is due to iron trace elements in the carbonate lattice. A collector's item with didactic value, ideal as a solitaire in a collection.
Wir beziehen unsere Kristalle direkt aus den Minen, ohne Zwischenhändler. Mehrmals im Jahr sind wir persönlich vor Ort und kennen die Familien, die diese Steine zutage fördern.
Sie erhalten einen fairen Preis für ihre Arbeit. In unseren Minen arbeiten ausschließlich Erwachsene unter sicheren Bedingungen, und davon überzeugen wir uns bei jedem Besuch.
Wie das vor Ort aussieht, zeigen wir in einem Film, der bei uns im Museum läuft.
Protect from direct sunlight. Calcite twin acid-sensitive, clean dry with a soft cloth, no harsh cleaner.
Silikat (Quarz-Gruppe)
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