What is Emerald?
Emerald is the green gem variety of beryl, coloured mainly by chromium and/or vanadium and valued for its saturated colour and jardin inclusions.
Mineralogy and structure
Reference formula: Be3Al2Si6O18. Emerald is not a separate mineral species: its host is beryl. The guide uses the beryl lattice as a clearly labelled representative structure model. Fractures and inclusions are common, so clarity should be described rather than assumed.
Colour and appearance
Typical colours include green, blue-green. The usual prismatic, columnar, massive habit and vitreous lustre are useful descriptive features, but colour alone is not diagnostic.
Formation and localities
Emerald forms in or is associated with granitic pegmatites, mica schists, hydrothermal veins and tectonic fluid systems. Important documented localities include Colombia, Zambia, Brazil, Afghanistan, Pakistan, Russia and Ethiopia.
Collecting and care
Protect from impact, thermal shock, ultrasonic cleaning and aggressive oil or resin treatments; inclusions can reach the surface.
Emerald in popular symbolism
Modern crystal guides sometimes associate Emerald with symbolic themes based on colour or collecting tradition. These associations are cultural interpretations, not mineralogical or medical properties.
