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Sillimanite Single |
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Sillimanite Faceted |
Sillimanite Cabochons |
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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Overall Rating -> 10 
Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.
Overall Rating -> 8 
purchased birthstones to be mounted into stud earrings as a gift for a friend's gift
Overall Rating -> 10
This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!
Overall Rating -> 10
The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.
Overall Rating -> 10
Great selection and excellent website.
Overall Rating -> 10
I found it to be easy to browse and easy to use
Overall Rating -> 9 
I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.
Overall Rating -> 10
I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.
Overall Rating -> 9
The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.
Overall Rating -> 10
Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!
Overall Rating -> 10
Great selection of various gems, easy to navigate site
Overall Rating -> 10
Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.
Overall Rating -> 10
I was looking for ammolite for my husband. Other websites are not always clear about whether they have genuine ammolite or simulated ammolite. I have purchased from GemSelect before and trust that the stones are genuine. Finding the stones I want is easy, and I love all of the search filter options!
Overall Rating -> 9
Overall good, shipping prices just seem a little on the high side.
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