The. Emeralds

Emerald Emerald Green gemstone, a beryl variety For other uses, see Emerald (disambiguation). Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)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. It occurs mainly in association with quartz, muscovite, albite, schorl, microcline, fluorite, smoky quartz and elbaite.[1] Quick facts General, Category ... Emerald Emerald crystal from Muzo, Colombia General Category Beryl variety Formula Be3Al2(SiO3)6 Crystal system Hexagonal (6/m 2/m 2/m) Space group: P6/mсc Space group (6/m 2/m 2/m) – dihexagonal dipyramidal Unit cell a = 9.21…

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