Cryptocrystalline

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Cryptocrystalline”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Didier Descouens, CC BY-SA 4.0, via Wikimedia Commons.