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Beryl color go round
Aquamarine, Emerald, Heliodor , and Morganite are each a differently colored variety of the species Beryl. (Minerals, George Robinson.)Beryl, morganite, aquamarine, and heliodor [Credit: Chris Ralph]mineral composed of beryllium aluminum silicate, Be3Al2(SiO3)6, a commercial source of beryllium. It has long been of interest because several varieties are valued as gemstones. These are aquamarine (pale blue-green); emerald (deep green); heliodor (golden yellow); and morganite (pink). Beryl is a minor constituent of many granitic rocks and associated pegmatite dikes, in gneisses, and in mica schists. The gem varieties (other than emerald) commonly are found in cavities in pegmatites. Emeralds occur in mica schist and in bituminous limestone.
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