Composition not stated
P3m (C3v)
conditions not stated; default record
Weis & Gaylord 1985 prints the Schoenflies symbol as C6v, a typo; 3m is C3v. Same in Volk & Wöhlecke 2009 p. 2.
Weis & Gaylord, Applied Physics A 37 191-203 (1985), p. 192, Sec. 2.1