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Aquamarine (from Latin: aqua marina, "water of the sea") is a blue or turquoise variety of beryl. It has a hardness of 8 on the Moh's scale.   

In the United States, aquamarines can be found at the summit of Mt. Antero in the Sawatch Range in central Colorado. In Wyoming, aquamarine has been discovered in the Big Horn Mountains, near Powder River Pass. In Brazil, there are mines in the states of Minas Gerais, Espírito Santo, and Bahia, and minorly in Rio Grande do Norte. The mines of Colombia, Zambia, Madagascar, Malawi, Tanzania and Kenya also produce aquamarine.  The finest aquamarine is from the Santa Maria mine in Brazil.  It is often referred to as "ultra-marine" because of the extremely deep blue color.

During the Middle Ages, aquamarine was noted to to be seen as the symbol of purity, and doctors used it as a remedy for stomach ailments, to relieve asthma, and to relieve liver problems.  Beryl was thought to provide protetion against malicious threats (such as  poisoning) and to prevent disputes--including marital discord.

The largest aquamarine of gemstone quality ever mined was found in Marambaia, Minas Gerais, Brazil, in 1910. It weighed over 110 kg, and its dimensions were 48.5 cm (19 in) long and 42 cm (17 in) in diameter.