Abstract
Samples from a continuous culture at 25°C and pH ≈ 8 of sulfate-reducing bacteria and subsamples heated in evacuated silica tubes at 120°C yielded a new phosphate compound. The chemical formula is estimated to be: The compound was formed as elongated, thin, transparent crystals together with various forms of iron sulfides. From electron and X-ray diffraction measurements the unit cell dimensions are: a = 8.33, b = 12.86, c = 17.55A, β = 102.6°, and Z = 4. The symmetry is monoclinic, with space group P21/c.
The continuous cultivation of bacteria was performed under chemical conditions as commensurate as possible with those in modem sediments. The compound may thus be important for phosphate fixation in reduced sediments in connection with authigenic iron sulfide mineralization.
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