Charoite

Charoite is a rare violet silicate mineral, K(Ca,Na)2Si4O10(OH,F)·H2O, first described in 1978 and reported only from the Aldan Shield in Siberia; it is named for the Chara River. Wikipedia describes it as translucent lavender to purple with a swirling, fibrous look and a pearly lustre, and says that when found it was thought to be fake or dyed. Hall calls it purple and a stone of transformation, and associates it with overcoming fear, inner vision, calming stress and deep sleep. Cunningham has no entry for it. Wikipedia adds that it is strictly massive, with conchoidal fractures, and a Mohs hardness of 5 to 6. Those uses are Hall's claims, not shown properties of the mineral.