Sillimanit
| Sillimanit | |
|---|---|
 |
|
| Općenito | |
| Kategorija | Mineral |
| Kemijska formula | AlVI AlIV[OSiO4] |
| Identifikacija | |
| Boja | sivobijela do žuta |
| Kristalni habitus | dugoprizmatičan, vlaknast |
| Kristalni sustav | rompski, k.r.mmm |
| Kalavost | savršena po {010} |
| Lom | igličast |
| Mohsova tvrdoća | 7,5 |
| Sjaj | staklast, sedefast do gotovo dijamantan |
| Indeks loma | Np = 1, 658 - 1,670, Nm = 1,673 - 1,670, Ng = 1,673 -1,684 |
| Ogreb | bijel |
| Gustoća | 3,25 |
| Prozirnost | proziran do poluproziran |
Silimanit je alumosilikatni mineral s kemijskom formulom Al2SiO5. Dobio je ime prema američkom kemičaru Benjaminu Sillimanu (1779. – 1864.).
Nalazišta
Silimanit je jedan od tri alumosilikatna polimorfa - druga dva su andaluzit i kijanit i najrjeđi je među njima. Čest varijetet silimanita poznat je kao fibrolit, a nosi to ime zato što se pojavljuje kao snop međusobno sraslih vlakana koja se vide i pod malim povećanjima, pa čak i golim okom. I vlaknaste i forme običnih kristala silimanita česte su u metamorfoziranim sedimentnim stijenama.
Polimorfi
Alteracije
Pri izuzetno visokim temperaturama i silimanit i oba njegova polimorfa mogu prijeći u mulit, Al6Si2O13.
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