Natural Sillimanite

Sillimanite also called FIBROLITE, is brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needlelike crystals frequently found in fibrous aggregates. An aluminum silicate, Al2OSiO4, it occurs in high-temperature regionally metamorphosed clay-rich rocks (e.g., schists and gneisses). Sillimanite is found at many points in France, Madagascar, and the eastern United States; a pale sapphire-blue gem variety occurs in the gravels of Sri Lanka.

Find your Sillimanite

Our Sillimanite(s) are available in various shapes, sizes and colors. 13 Sillimanite(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Sillimanite Profile

Color information:	violet blue, grey green, colorless, brown, green,
Refractive Index:	1.658 - 1.678
Chemical Composition:	Al2OSiO4
Hardness:	6 - 7.5
Density:	3.25
Crystal Group:	Orthorhombic
Ocurrence:	France, Madagascar, U.S.A., Sri Lanka, Burma. Kenya
Sign of the Zodiac:	N/A
Month of the year:	N/A

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