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A geode is basically a pocket or space or vug in an igneous or sedimentary rock structure that has partially filled or completely filled with minerals that have formed as a result of solutions entering the space. Because the mineralization mostly involves silicate deposition, the geode may be more erosion resistant that the rock that surrounds it. When the surrounding rock weathers and erodes, the geodes remain.
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What is the scientific name for geode?
Geode is the scientific name. It is derived from Greek and means "earthlike."
Is a geode considered a crystal?
Yes, a geode is considered a crystal because it is a hollow rock formation that contains crystals inside.
What is a crystal-lined rock called?
A crystal-lined rock is called a geode. Geodes are hollow rocks that contain sparkling crystals inside, formed by minerals depositing in the cavities of the rock over time.
How does a geode form?
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.
What is a rock ball with a crystal filled cavity?
A geode is a rock ball with a crystal-filled cavity. Geodes are typically round or egg-shaped and formed in sedimentary or volcanic rocks. When cracked open, they reveal beautiful crystals inside.
