Noun
Same as Fibrolite.
Source: Webster's dictionaryA subgroup is the andalusite -, staurolite -, kyanite - and sillimanite -schists which usually make their appearance in the vicinity of gneissose granites, and have presumably been affected by contact metamorphism. Source: Internet
Kyanite is triclinic, while andalusite and sillimanite are both orthorhombic and belong to the dipyramidal point group. Source: Internet
It consists of sillimanite K-feldspar grade schist and gneiss intruded by numerous sills and dikes of leucogranite ranging in thickness from 1 cm to 1,500 m (0.4 in to 4,900 ft). Source: Internet
In this example, the rock has prominent sillimanite porphyroblasts as large as convert. Source: Internet