Beryl

Beryl has the chemical composition Be₃Al₂(SiO₃)₆ and is classified as a cyclosilicate. It is the principal ore for the element beryllium. It has several gem varieties with inclusions of small amounts of impurities. The inclusion of chromium or vanadium can produce the green emerald. Other varieties are the pale green to blue aquamarine, the pale yellow to yellowish orange heliodor, pale pink to salmon colored morganite, and the colorless gem goshenite.

This red beryl sample is displayed in the Smithsonian Museum of Natural History. The long dimension is perhaps 5 cm.

The largest of the mounted red beryl gems above is about a half centimeter across.