单词	cryptocrystalline
释义	cryptocrystalline /ˌkrɪptəʊˈkrɪst(ə)lʌɪn / adjective Having a crystalline structure visible only when magnified: non-porous cryptocrystalline limestone... The textures of thunder eggs can vary from distinctly radiating fibrous textures to cryptocrystalline aggregates that preserve the structure of the original rhyolite. Silica precipitated from aqueous solution at low temperatures gives cryptocrystalline varieties such as opal, jasper, chalcedony, agate, carnelian, onyx, flint, and chert. In these, the spicular aspect grades abruptly inward into dense cryptocrystalline silica, which forms the bulk of the specimen.
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