Peridot is a yellow-green stone that comes from the mineral olivine. Some believe its name derives from the Arabic "faridat," or "gem," according to Geological Institute of America. Others, however, ...
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 ...
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