Moore, Paul B. Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois.
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A nesosilicate mineral of composition Al2O[SiO4], crystallizing in the orthorhombic system, space group Pbnm, a = 0.744, b = 0.760, and c = 0.575 nanometers, with four formula units in the cell. Sillimanite commonly occurs in slender crystals or parallel groups, and is frequently fibrous, hence the synonym fibrolite (see illustration). There is one perfect cleavage, luster is vitreous, color is brown, pale green, or white, hardness is 6–7 on Mohs scale, and the specific gravity is 3.23.
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