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Emerald crystal from Muzo, Colombia
General
Category	Beryl variety
Chemical formula	Beryllium aluminium silicate with ??????? , Be 3 Al 2 (SiO 3 ) 6 ::Cr
Identification
Color	Green
Crystal habit	Hexagonal Crystals
Crystal system	Hexagonal
Cleavage	Poor Basal Cleavage (Seldom Visible)
Fracture	Conchoidal
Mohs scale hardness	7.5 ? 8.0
Luster	Vitreous
Streak	White
Specific gravity	2.70 ? 2.78
Refractive index	1.576 ? 1.582
Pleochroism	Distinct, Blue-Green/Yellow-Green

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