The first way to think of the spinel structure is the array of Al atoms. They sit on the corners of tetrahedra which share corners infinitely in 3 dimmensions, an array known as a Kagome net. The ...

The vivid red color in these spinel specimens from Myanmar equals the finest red color in any gem. - © GIA & Tino Hammid Spinel is generally highly sought after by ...

Pink to red spinel is in high demand among gem connoisseurs. - Courtesy a Private Collector and Mona Lee Nesseth, Custom Estate Jewels Spinel, like garnet and diamond, is singly refractive, with the ...