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A geode ( / ˈdʒiː.oʊd /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
Une géode est une cavité rocheuse tapissée de cristaux (souvent automorphes) et d'autres matières minérales. Ce n'est pas vraiment un minéral mais une composition de formations magmatiques, cristallines et/ou sédimentaires.
1 juil. 2024 · Les géodes sont de forme sphérique ou oblongue roches qui paraissent insignifiants de l'extérieur. Cependant, lorsqu'ils sont fissurés ou coupés, ils révèlent un affichage époustouflant de minéraux et des cristaux à l'intérieur. La formation des géodes commence par une activité volcanique ou sédimentaire.
11 juin 2024 · Geode, hollow mineral body found in limestones and some shales. The common form is a slightly flattened globe ranging in diameter from 2.5 to more than 30 cm (1 to 12 inches) and containing a chalcedony layer surrounding an inner lining of crystals.
1 juil. 2024 · Geodes are spherical or oblong-shaped rocks that appear unremarkable from the outside. However, when they are cracked open or cut, they reveal a breathtaking display of minerals and crystals within. The formation of geodes begins with volcanic or sedimentary activity.
Geodes are spherical to subspherical rock structures with an internal cavity lined with mineral materials. They have a durable outer wall that is more resistant to weathering than the surrounding bedrock. This allows the geode to survive intact when the surrounding bedrock weathers away.
10 août 2022 · Simply speaking, geodes are hollow rocks that contain an insanely beautiful array of crystal formations inside. And depending on the minerals that make up the geode, different geodes will contain different kinds of crystals, such as amethyst, agate and quartz.
