Figure F9. XRD spectrum of glauconitic nodule, as commonly observed in the upper cores of Site U1404. Data are from the center of the nodule shown in the inset. Glauconite belongs to the illite group and therefore shares several reflection peaks with illite. The distinction between glauconite and illite has been made by the lack of the 5 Å peak (17.7°2θ) for glauconite.
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