Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...
Another perspective on spinel comes from looking at its unit shell (counter-intuitive, I know). First we show the Mg atoms, which form an fcc aray, plus 4 more atoms inside the cube. Those 4 are ...
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