The strongest reflections from the holotype specimen of melanovanadite, Ca2V44+V65+O257H2O, are 8.40Å(100), 4.2lÅ(55) and 2.97Å(50). The triclinic unit cell was refined to be a 6.357(2)Å, b 16.868(4)Å, c 6.274(2)Å, α 90.04(2)°, β 101.60(2)°, and γ 93.20(3)° in space group Al. The D calc, of the chemical formula of Ca2V44+V65+O257H2O is 2.86 compared to the D meas. of 2.90 and 2.83.

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