FORBIDDEN CRYSTAL SYMMETRY, by Oxford’s eccentric and brilliant Sir Roger Penrose. While rigorous mathematical theory suggests that crystal symmetry can only go to 6-fold, symmetry forms up to 12-fold have been described. And, 5-fold and 12-fold crystal forms do occur in nature.
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linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022