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Penrose_Tiling_RhombiWater, it turns out, has an excellent track record of surprising both experimental and theoretical scientists despite the amount of research thrown at it.  There are 15 known forms of 3 dimensional crystalline ice (see chart below), which form under different conditions.  None of them, fortunately, resemble anything like Ice-nine, the fictional form of frozen water in Kurt Vonnegut’s novel Cat’s Cradle.  Instead, most of the ices are fairly unstable at normal conditions, with only the most common kind, I-h or hexagonal ice, found in the “wild” so to speak. At Neomatica