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 ...
Other mining sites include China, Myanmar, Pakistan, Tanzania, Vietnam and the United States. Peridot is often given as gifts for the sixteenth wedding anniversaries. Spinel comes in a variety of ...
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