In mineralogy and crystallography, describing a crystal system or form that has two sets of three-fold rotational symmetry axes.
From di- (two) plus trigonal (from tri- meaning three plus -gonal relating to angles). The term was developed in mineralogy during the 19th century to classify crystal structures precisely.
Ditrigonal crystals have a special three-fold symmetry that's uncommon but gorgeous—if you spin them 120 degrees three times, they look the same. Mathematicians and crystal collectors find this symmetry absolutely beautiful, like nature's own repeating wallpaper pattern!
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