Methamorpic Rock .
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A crystal-lined rock is commonly referred to as a geode. Geodes are spherical rocks that contain a hollow cavity lined with crystals, typically formed in volcanic rocks or sedimentary deposits.
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.
The rock formed by cooling a liquid rock after processing is called a crystal.
The parallel crystal arrangement of layers in metamorphic rock is called foliation. Foliation is a common feature in rocks that have undergone intense heat and pressure, resulting in the alignment of mineral grains into distinct layers.
They're called geodes. Basically, they're cavities in the molten material (magma) in the form of gas bubbles. The mineral rich solution seeps in and crystallizes and grows until all the solution is exhausted. That's why sometimes you'll end up with a crystal filled cavity and other times the whole void is filled in with interlocking crystals.
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.