Emerald

For other things of this name, see Emerald (disambiguation).

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Emerald (Be3Al2SiO6) is a variety of the mineral beryl, colored green by trace amounts of chromium and sometimes iron. It is highly prized as a gemstone and by weight is the most valuable gemstone in the world, often made more so by inclusions. Beryl has a hardness of 8 on the 10 point Mohs scale of hardness.

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Emerald is a rare and valuable gemstone and, as such, provided the incentive for developing synthetic emeralds. Both hydrothermal and flux-growth synthetics have been produced and a method has been developed for producing an emerald overgrowth on colorless beryl. Synthetic emeralds fluoresce a dull red with long wave UV whereas most natural specimens do not. Also both the specific gravities (natural: 2.70 - 2.78, synthetic: 2.66) and refractive indices (natural: 1.576 - 1.582, synthetic: 1.565) of synthetics are slightly lower. Wispy inclusions are common in flux-grown synthetic emeralds.

Mineral: This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band)....

Beryl: The mineral beryl is a beryllium aluminium cyclosilicate with the chemical formula Be3Al2(SiO3)6. The hexagonal crystals of beryl may be very small or range to several meters in size. Terminated crystals are relatively rare. Beryl exhibits conchoidal fracture, has a hardness of 7.5-8, a specific gra...

Chromium: Chromium is a chemical element in the periodic table that has the symbol Cr and atomic number 24....

Emerald related Images and Photos (experimental)

Emerald Sun	Emerald Eyes	Emerald City	Emerald Water
Emerald Sunset	Code Name: Emerald (DVD)	Emerald Bay Lake Tahoe	The Emerald Forest
Emerald Bay Lake Tahoe California USA	Green Lantern: Emerald Knights	Code Name - Emerald (1985)	Green Lantern: Emerald Knights: Special Edition (DVD)