Definitions for "Sillimanite"
An aluminum silicate mineral usually found in fine fibrous masses and associated with intensely metamorphosed mica schists and gneisses and contact-metamorphic deposits.
polymorph whose other two minerals are kyanite and andalusite.
Is a transparent to translucent mineral that ranges in color from white to gray to brown to green. It has the same chemical composition as Kyanite and Andalusite with Sillimanite being the rarest of the three.
Keywords:  fibrolite
Same as Fibrolite.