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Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium or sometimes vanadium. [2] Beryl has a hardness of 7.5–8 on the Mohs scale. [2] Most emeralds have many inclusions, [3] so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.
Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium and sometimes vanadium. [1] Beryl has a hardness of 7.5–8 on the Mohs scale. [1] Most emeralds are highly included, [2] so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.
Emerald is a rare and valuable gemstone and, as such, it has provided the incentive for developing synthetic emeralds. Both hydrothermal [37] and flux-growth synthetics have been produced. The first commercially successful emerald synthesis process was that of Carroll Chatham. [38]
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [ 1 ] [ 2 ] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980 .
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
Duke of Devonshire Emerald – this emerald was named after the sixth Duke of Devonshire. This precious gem can now be viewed in a vault at the Natural History Museum in London. [4] Patricia Emerald – this 630-carat, di-hexagonal cut was first discovered in 1920. It is named after the mine owner's daughter, Patricia.