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Figure F11. Image of tabular specimen of the mineral struvite, Hole U1357A (interval 318-U1357A-8H-8, 54–55 cm). Struvite is NH4MgPO4·6H2O and is thought to form by bacterial biomineralization processes in anoxic sediments with abundant dissolved ammonium. Struvite was mostly observed as tabular crystalline layers aligned parallel with bedding or laminations.

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