Space groups (156) P3m1-(148) R-3

In the 1970s Landolt-Boernstein published a series of volumes containing crystallographic data for organic (III/5 Str- ture Data of Organic Crystals), intermetallic (III/6 Structure Data of Elements and Intermetallic phases) and inorganic compounds (III/7 Crystal Structure Data of Inorganic Compounds).