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1 results

  • X-ray diffraction studies of vivianite, metavivianite, and barićite

  • T. Sameshima, G. S. Henderson, P. M. Black, K. A. Rodgers
  • Journal:
    Mineralogical Magazine / Volume 49 / Issue 350 / March 1985
    Published online by Cambridge University Press:
    05 July 2018, pp. 81-85

  • Vivianite specimens from various world localities yield X-ray powder patterns of two types: one corresponds with that shown by synthetic Fe3(PO4)2 · 8H2O and is not readily distinguished from that of barićite; the second shows reflections of monoclinic vivianite and triclinic metavivianite along with reflections of a bobierrite-type phase. The triclinic phase occurs as two twin-related lattices with twin plane 110 being the structural equivalent of 010 in the monoclinic phase. The relationship of the bobierrite-type lattice to the other two has not been established. The ternary pattern is produced by some coarse-grained vivianites on natural oxidation. Finer grained vivianites oxidise to an X-ray amorphous state without passing through a triclinic intermediate.