Physical Properties
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Physical Properties of Emerald
Emerald is said to be the Queen of the Gems belonging to the planet Venus. The name Emerald comes from the Greek word 'smaragdos' via the Old French 'esmeralde',meaning 'green gemstone'. Emerald symbolizes hope, love and is also considered to act like a sedative for the anxious mind. The most favourable time for the Emerald is during the Spring season, it is said that the power of Emerald increases during this period.
PROPERTIES OF EMERALD

   
Color : Yellow-green, apple-green, olive-green to brownish.
Moh’s hardness : 6.5-7
Refractive index : 1.654-1.69
Critical angle : 37°
Specific gravity : 3.27-3.37
Cleavage : Imperfect
Fracture : Brittle, small conchoidal.
Dispersion : Moderately high (.02)
Heat sensitivity : Low to medium
Pleochroism: Dichroic : very weak (colorless or light green to deeper yellow-green or olive-green).
Birefringence (double refraction) : Medium (.036)
Crystal structure : Orthorhombic
Optical Character : Bixial +
Family : Magnessium and Iron Silicate
Accompanied by : Feldspar and mica
Peridot Chemical composition : (MgFe)2SiO4
Transparency : transparent to translucent
Streak : colorless
Class : nesosilicate
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