Weddellite in Bottom Sediment from the St. Lawrence and Saguenay Rivers: NOTES
1970
ABSTRACT Weddellite (a hydrated calcium oxalate), previously reported from the central Weddell Sea, Antarctica, has been identified from bottom sediments of the Saguenay and St. Lawrence Rivers, Canada. Identification was carried out by optical and X-ray diffraction techniques. X-ray characteristics determined on whole crystals compared closely with characteristics of weddellite from human kidney stones and from synthesized calcium oxalate hydrates. The weddellite of this report appears to have formed authigenically in the bottom sediment, where it is associated with deposits of wood fiber. It is speculated that the mineral formed as a result of the presence of calcium oxalate, commonly found in plant cells, in interstitial water. Although an alkaline environment is necessary to its stability, other factors that favor its formation are not known.
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