Indexed powder diagrams of volborthite, Cu3(VO4)2.3H2O, from Monument Valley, Arizona, disclose it to be monoclinic (space group C2, Cm, or C2/m), the unit cell [a = 10.604(2), b = 5.879(l), c = 7.2O2(2) Å, β = 94.81(2)°]1containing two formula units. Calculated density, 3.52 g/cm3, compares with 3.42 g/cm3, the value measured by Guillemin (1956).

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