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You Selected (328): Sillimanite - Cat's Eye Sillimanite Clear All
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1 pc
0.77 ct Sillimanite
6 x 5.8 mm
$ 26.95
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4 pcs
1.03 ct (total 4.11ctw) Sillimanite
8 x 6 mm
$ 143.85
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4 pcs
1.19 ct (total 4.75ctw) Sillimanite
7.1 x 5 mm
$ 166.25
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1 pc
2.76 ct Sillimanite Cat's Eye
9.4 x 6.6 mm
$ 19.32
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5 pcs
1.04 ct (total 5.18ctw) Sillimanite
6.6 x 4.9 mm
$ 181.30
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1 pc
1.33 ct Sillimanite Cat's Eye
6.7 x 5.7 mm
$ 3.99
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1 pc
1.50 ct Sillimanite
9 x 6.8 mm
$ 33.86
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2 pcs
2.80 ct (total 5.60ctw) Sillimanite
10.3 x 8 mm
$ 126.39
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4 pcs
0.87 ct (total 3.49ctw) Sillimanite
7 x 5.1 mm
$ 122.15
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4 pcs
0.87 ct (total 3.48ctw) Sillimanite
7 x 5.2 mm
$ 121.80
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1 pc
1.58 ct Sillimanite
8.1 x 6 mm
$ 35.66
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5 pcs
1.10 ct (total 5.52ctw) Sillimanite
7.1 x 5.1 mm
$ 193.20
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4 pcs
0.84 ct (total 3.35ctw) Sillimanite
6.9 x 5 mm
$ 117.25
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1 pc
1.35 ct Sillimanite
8 x 6.1 mm
$ 30.47
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2 pcs
1.67 ct (total 3.33ctw) Sillimanite
8 x 6.1 mm
$ 116.55
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5 pcs
0.86 ct (total 4.31ctw) Sillimanite
7 x 5.1 mm
$ 150.85
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2 pcs
2.58 ct (total 5.16ctw) Sillimanite
10 x 7.8 mm
$ 116.46
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1 pc
1.37 ct Sillimanite Cat's Eye
7.8 x 4.6 mm
$ 4.11
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2 pcs
2.55 ct (total 5.09ctw) Sillimanite
10.1 x 8 mm
$ 114.88
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4 pcs
0.98 ct (total 3.93ctw) Sillimanite Cat's Eye
7.1 x 4.7 mm
$ 14.23
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1 pc
0.91 ct Sillimanite
7 x 5 mm
$ 31.85
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Sillimanite
Sillimanite is an aluminum silicate, related to both andalusite and kyanite. In fact these three minerals are polymorphs - they share the same chemical composition but different crystal structures.
Sillimanite is named after the American chemist Benjamin Silliman (1779-1864). Silliman was one of the first American professors of science and taught at Yale University.
Sillimanite gems may show a cat's eye and be cut en cabochon, or they may be faceted, transparent gemstones. The colors of sillimanite include colorless, grayish-white, green, bluish and brownish. A fibrous variety of sillimanite is traded as "fibrolite". Some sillimanite gemstones show pleochroism, which means that several colors may be exhibited in a single gemstone depending on the viewing angle.
Sillimanite is an aluminum silicate, related to both andalusite and kyanite. In fact these three minerals are polymorphs - they share the same chemical composition but different crystal structures.
Sillimanite is named after the American chemist Benjamin Silliman (1779-1864). Silliman was one of the first American professors of science and taught at Yale University.
Sillimanite gems may show a cat's eye and be cut en cabochon, or they may be faceted, transparent gemstones. The colors of sillimanite include colorless, grayish-white, green, bluish and brownish. A fibrous variety of sillimanite is traded as "fibrolite". Some sillimanite gemstones show pleochroism, which means that several colors may be exhibited in a single gemstone depending on the viewing angle.
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