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Deutsche kryptokristallin {adj} [min.] Synonyme

Englische cryptocrystalline; microfelsitic; microaphanitic Synonyme

cryptocrystalline Definition

Cryptocrystalline
(a.) Indistinctly crystalline

cryptocrystalline Bedeutung

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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 acidic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian or tachylyte , which are natural rock glasses. Onyx is also a cryptocrystalline.

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