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BERYL

Beryl is  the name for a family of minerals with the chemical composition Be3Al2(SiO3)6  (Beryllium Aluminium Oxide) which in its pure form is colourless and is known as the gemstone Goshenite
Other members of the Beryl group include Emerald, blue Aquamarine, pink Morganite and yellow Helodore.
The colours of varieties of Beryl are caused by atomic impurities, which in the case of Emerald are Chromium and Vanadium. The limpid blue of Aquamarine is caused by Iron, as are the yellow to brown colours in Heliodore, while Morganites pink is due to the presence of Manganese.
Rare varieties include red Beryl, also known as Bixbite.