Cat s eye sillimanite is almost always brownish in color but high quality gemstones can exhibit a very strong violet hue. The colors of sillimanite include colorless grayish white green bluish and brownish. Sillimanite is considered to stimulate the production of endorphins in the human body. Sillimanite cat s eye cabochon natural brown cat s eye oval shape matched pair cabochon gemstone cat s eye smooth loose gemstone 8x7x5 mm qualityrealgems 5 out of 5 stars 2 9 00 18 00 18 00 50 off. Approximately the same as that of spodumene its specific gravity is 3 23 to 3 27 placing it between apatite and diopside on the density scale.
When polished as cabochons they glow mysteriously like a cats eye at night. This can be seen more often in faceted gemstones than in cabochon sillimanite gems. It is even believed increasing energy and a general feeling of well being. Some sillimanite gemstones show pleochroism which means that several colors may be exhibited in a single gemstone depending on the viewing angle. Sillimanite gems may show a cat s eye and be cut en cabochon or they may be faceted transparent gemstones.
Like diamond topaz and fluorite sillimanite has perfect cleavage. Compact masses of sillimanite were once used by native americans of the american southwest as fashion tools. Buy now and receive 10 off your first purchase. These crystals make beautiful rings. Historically sillimanite is a rare gemstone known mainly to collectors.
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Sillimanite clarity and luster. Beautiful sillimanite cabochons for sale online. It has a refractive index of 1 655 to 1 684. Sillimanite is an aluminum silicate and is closely related to andalusite and kyanite. Sillimanite occurs in a number of colors.
63 15 carats 22 71 x 22 40 x 13 93 mm. Sillimanite has a hardness of 6 5 to 7 5 on the mohs scale and a vitreous to silky luster. The cats eye that runs down the stone is a silver stripe. A fibrous variety of sillimanite is traded as fibrolite. Sillimanite is a brittle stone rating a 6 7 on the hardness scale.
Sillimanite is a brittle stone rating a 6 7 on the hardness scale. 63 15 carats 22 71 x 22 40 x 13 93 mm. Sillimanite clarity and luster. It is a very difficult stone to cut. Like diamond topaz and fluorite sillimanite has perfect cleavage.
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A fibrous variety of sillimanite is traded as fibrolite. When polished as cabochons they glow mysteriously like a cats eye at night. Cat s eye sillimanite is almost always brownish in color but high quality gemstones can exhibit a very strong violet hue.
