The detailed magnetic behavior of K-3[Ru-2(CO3)(4)]center dot xH(2)O (x=2) reveals that it has a 2-K magnetization at 5 Tot 11 125 emu Oe/mol, a 50-Oe coercive field, and a remnant magnetization of 670 emu Oe/mol. It magnetically orders as a canted ferrimagnet below 4.2 K, and is a rare example of a magnetically ordered material based on a second row transition metal. The magnetic ordering confirms that the S not equal 0 M(II) site that bridges the layers in previously reported HxK1-xMII-[Ru-2(II/III)(CO3)(4)](H2O)(y)(MeOH)(2) (M = Mn, Fe, Co, Ni, Cu, Mg) does not contribute to the magnetic behavior that leads to magnetic ordering.