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A geode forms in a pocket or hollow circular shaped opening in sedimentary or igneous rock. The opening could be created by a gas bubble, a rotted organism, or by other means. Mineral filled solutions seep into the opening and gradually form crystals from the hole lining inward. If the hole completely infills, it becomes a nodule. Because the minerals that form inside the pockets are often silicate, they are resistant to weathering. This means that the rock surrounding the pocket may not be as resistant to weathering as the geode pocket. Once the surrounding rock has weathered and eroded, what remains on the surface is the geode or nodule. Once an empty circular shaped hole it is now a rock formation unto itself.
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What is the origin of the word geode?
The word "geode" comes from the Greek word "geoides," which means "earthlike" or "having the form of the Earth." Geodes are spherical rocks that contain crystals inside.
What is a geode with flint in it?
A geode with flint inside would be a type of geode that contains the mineral flint, a hard, sedimentary cryptocrystalline form of the mineral quartz. Geodes are typically round rock formations that contain hollow cavities lined with crystals or mineral deposits, and finding flint inside one would be an uncommon but interesting occurrence.
What is the scientific name for geode?
Geode is the scientific name. It is derived from Greek and means "earthlike."
What is the luster streak and hardness of a geode?
A geode typically has a vitreous luster, meaning it appears shiny like glass. The streak of a geode is usually white or colorless because it is made up of crystallized minerals like quartz or calcite. Geodes have a hardness of around 7 on the Mohs scale due to the presence of minerals like quartz.
How long does it take for a geode to form?
Unknown, but one theory is appx 240m years. There is much that is still not understood about the mysterious geode.
