Cristal plan de type fougère (P1g selon la classification de Nakaya (1954) ; P1f selon la classification de Magono and Lee (1966) et P3c selon classification de Kikuchi et al. (2013)).
Snow crystal, plan, fernlike crystal (P1g-type in Nakaya classification (1954) ; P1f-type in Magono and Lee classification (1966) and P3c-type in Kikuchi et al. global classification of snow crystals, ice crystals, and other solid precipitation (2013).