This natural Brown Sillimanite Cat's Eye originates from Madagascar and its weight is about 8 carats. The measurements are 15.18mm x 8.76mm x 7.23mm (length x width x depth). The shape/cut-style of this Sillimanite Cat's Eye is Oval Cabochon. This 8.24ct Sillimanite Cat's Eye gem is available to order and can be shipped anywhere in the world. Gemstone Certification can also be provided as an optional service.
About Sillimanite Cat's Eye
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.
I have no problems with GemSelect except that the shipping is a little high for the amount of time it takes to get product. Also, how do I get a coupon? I buy regularly but have never been offered a coupon or discount.