Mineral: | Sillimanite (Fibrolite)
| Chemical Formula: | Al2SiO5 | Size: | 15,2 x 5,3 x 4,5 & 11,4 x 11,2 x 6,9 mm | Weight: | | Transparence: | | Quantity: | | Origin: | Ohngaing (Ohn Gaing; Ohn Kai) village, near Mogok, Burma (Myanmar) | A quiet sharp single terminated sillimanite crystal with bright blue coloration and distinctive, sharp habit. Normally crystals from this species are pretty rounded by fluviatile transport. In general andalusite is a polymorph variety of Kyanite or Sillimanite, chemical those are the same, the difference lays in the crystal structure, due to other pressure and temperature condition during the genesis. A variety of andalusite is chiastolite which is found west of Mandalay, while the sillimanite is found around Ohn Gaing.
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