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Geodes and veins are rock formations with crystal-lined cavities and euhedral surfaces, while pegmatitic textures feature rocks with very large crystals.
Geode is the correct word from the list that best fits the definition of a hollow rounded rock lined with crystals. Geodes are formed when minerals evaporate out in open spaces inside a rock, creating beautiful crystal-lined cavities.
Minerals from hot underground water can deposit in open spaces in rocks, leading to the formation of veins filled with crystals. These veins can show euhedral crystal surfaces and often get larger towards the center.
Residual molten material can give rise to rocks with pegmatitic texture, such as pegmatites, containing very large crystals like feldspar, quartz, and mica, indicating slow crystallization.
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