- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Kyanite in the form of large pseudomorphs of andalusite crystals showing perfectly preserved chiastolitic structure occurs in black pelitic schists of the Piriwiri series (Precambrian) in a narrow belt about 10 miles long in the Urungwe district, Southern Rhodesia. It is suggested that the inversion of andalusite to kyanite resulted from increasing hydrostatic pressure during the second of two phases of regional metamorphism. Six chemical analyses are given.