Frank Hoffmann’s favorite structure is:

Fencooperite

Fencooperite

Source: own work, made with VESTA

Why?

In my opinion one of the most beautiful nested structures, with many triangular appearing structural units, the planar CO3 units in the centered
channels, alternating pointing up- and downwards giving a six-fold appearance and then a kind of 3D Sierpinski triangles around them, hexagonal arranged, in between as glue the Ba atoms! Great!—Frank Hoffmann

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