a large specimen of rough natural charoite (K(Ca,Na)2Si4O10(OH,F)·H2O), a rare silicate mineral, first described in 1978 and named for the Chara River. It has been reported only from the Sakha Republic, Siberia, Russia.
Charoite is translucent lavender to purple in color with a pearly luster, strictly massive in nature and fractures are conchoidal. It has an unusual swirling, fibrous appearance and along with its intense color, can lead many to believe at first that it is synthetic or enhanced artificially.
Though reportedly discovered in the 1940s, it was not known to the outside world until its description in 1978. It is said to be opaque and unattractive when found in the field; a fact that may have contributed to its late recognition.