One of the mysteries of the English language finally explained.
Having a crystalline structure visible only when magnified.‘nonporous cryptocrystalline limestone’
- ‘In these, the spicular aspect grades abruptly inward into dense cryptocrystalline silica, which forms the bulk of the specimen.’
- ‘Silica precipitated from aqueous solution at low temperatures gives cryptocrystalline varieties such as opal, jasper, chalcedony, agate, carnelian, onyx, flint, and chert.’
- ‘This cryptocrystalline silica can preserve with high fidelity delicate shell detail such as musculature.’
- ‘The textures of thunder eggs can vary from distinctly radiating fibrous textures to cryptocrystalline aggregates that preserve the structure of the original rhyolite.’
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