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Geodes, or pumice, or zeolites, are secondary sedimentary structures found in sediments and some volcanic rocks. Geodes are independent, discrete masses of minerals of varying shapes, but are generally spherical or elliptical in shape.
70-million-year-old dinosaur egg was full of crystals!
Geodes, or pumice, or zeolites, are secondary sedimentary structures found in sediments and some volcanic rocks. Geodes are independent, discrete masses of minerals of varying shapes, but are generally spherical or elliptical in shape.