|Color||Grey, brown to light green.|
|Crystal form||Ortorombic. Long and thin crystals.|
|Luster||Glas or silk.|
|Habitat||Quite common in Sweden, as a ingredience in granites and gneiss. Larger aggregates are not so common. Also at the borderzones of pegmatites.|
|Notes|| All three disten minerals are used to high temperature
cheramics as in sparkplugs.|
Polymorphs : Kyanite and Andalusite
Sillimanite is created at temperatures higher than 550 degrees C and in all pressures.
| To silicate index.
|| Mineral group index.
If you have some questions, suggestions or comments you are welcome to write me a line or two.