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The real crystal structure of fukalite, Ca 4 Si 2 O 6 (OH) 2 (CO 3 ), was solved by means of the application of order-disorder (OD) theory and was refined through synchrotron radiation diffraction data from a single crystal. The examined sample came from the Gumeshevsk skarn copper porphyry deposit in the Central Urals, Russia. The selected crystal displays diffraction patterns characterized by strong reflections, which pointed to an orthorhombic sub-structure (the “family structure” in the OD terminology), and additional weaker reflections that correspond to a monoclinic real structure.

Fukalite: An example of an OD structure with two-dimensional disorder