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Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically in thin section by transmitted polarized light. Among the sedimentary rocks, chert and flint are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte (mafic), which are natural rock glasses. Agate and onyx are examples of cryptocrystalline silica (chalcedony).

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  • La textura criptocristalina (del griego κρυπτός kryptós 'oculto' y κρυστάλλινος krystállinos, 'de cristal') se refiere al aspecto físico de ciertas rocas que se caracterizan por estar formadas por cristales diminutos, no observables a simple vista.​ Su naturaleza cristalina solo es observable, e incluso con dificultad, en muestras cortadas en lámina delgada por medio del microscopio petrográfico o por medio de un microscopio electrónico.​ Entre las rocas sedimentarias, por ejemplo, el sílex y el chert son criptocristalinas. El carbonado, una forma de diamante conocida como «», también es criptocristalino. Algunas rocas volcánicas, especialmente las de tipo ácido, como las felsitas y las riolitas, pueden tener una matriz criptocristalina, a diferencia de la obsidiana (ácida) o la taquilita (básica), que son vidrios naturales, sin estructura cristalina. El ónix, la calcedonia y el ágata también presentan una textura criptocristalina. (es)
  • Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically in thin section by transmitted polarized light. Among the sedimentary rocks, chert and flint are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte (mafic), which are natural rock glasses. Agate and onyx are examples of cryptocrystalline silica (chalcedony). (en)
  • Une texture cryptocristalline (du grec κρυπτός, « caché », et κρυστάλλινος, « cristallin »), indique un aspect physique de certaines roches formées de cristaux de taille très petite, à peine visibles au microscope par lumière polarisée. Parmi les roches sédimentaires, la chaille et le silex sont cryptocristallins. Le carbonado également. Quant aux roches volcaniques, les roches acides comme la felsite et la rhyolite peuvent avoir une matrice cryptocristalline. L'obsidienne pure (acide) et la tachylyte (basique), qui sont des verres, sont aussi cryptocristallines. C'est enfin le cas de l'onyx, de la calcédoine et de l'agate. * Portail des minéraux et roches (fr)
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  • Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically in thin section by transmitted polarized light. Among the sedimentary rocks, chert and flint are cryptocrystalline. Carbonado, a form of diamond, is also cryptocrystalline. Volcanic rocks, especially of the felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte (mafic), which are natural rock glasses. Agate and onyx are examples of cryptocrystalline silica (chalcedony). (en)
  • La textura criptocristalina (del griego κρυπτός kryptós 'oculto' y κρυστάλλινος krystállinos, 'de cristal') se refiere al aspecto físico de ciertas rocas que se caracterizan por estar formadas por cristales diminutos, no observables a simple vista.​ Su naturaleza cristalina solo es observable, e incluso con dificultad, en muestras cortadas en lámina delgada por medio del microscopio petrográfico o por medio de un microscopio electrónico.​ (es)
  • Une texture cryptocristalline (du grec κρυπτός, « caché », et κρυστάλλινος, « cristallin »), indique un aspect physique de certaines roches formées de cristaux de taille très petite, à peine visibles au microscope par lumière polarisée. * Portail des minéraux et roches (fr)
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  • Criptocristalina (es)
  • Cryptocrystalline (en)
  • Cryptocristallin (fr)
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