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argillite
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argillite

geology
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Argillite is a compact, sedimentary rock primarily composed of clay minerals, cemented together by silica. It is distinguished by its lack of slaty cleavage, a characteristic that differentiates it from slate. The term "argillite" originates from the Latin word "argilla," meaning clay. The combining form "argill-" also signifies clay or an argillaceous (clay-like) quality. This rock type has been recognized and used in geological contexts since at least 1794.12

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