(NH4)2Cr4O13 is monoclinic (P21/c, isotypic with K2Cr4O13 and Rb2Cr4O13, with a = 17.82 (1), b = 7.658 (4), c = 9.360 (3) Å, β = 92.00 (1)° , V = 1276 Å3, Z = 4 and Dx = 2.35 Mg/m3.
The chemical preparation and crystal data for CuCr2OT.2H20 is given. Copper dichromate dihydrate is monoclinic (P21/n) with a= 13.19 (4), b=7.579 12), c=7-411 (2)/~,, fl= 105.81 (5) °, Dx= 2.94 Mg/m 3.
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