ar·gil·lite /ˈɑrʤəˌlaɪt/
矽質粘土岩,粘板岩
Ar·gil·lite n. Min. Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc. -- Ar*gil*lit*ic, a.
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argillite
n : a sedimentary rock differing from shale in being bound by
silica and from slate in having no slate cleavages