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Emerald | Blog

Formula Be3Al2Si6O18
Molecular mass 537.50 g/mol
admixture Fe2O3, V2O3, Cr2O3
IMA Status Valid
Systematics according to IMA (Mills et al., 2009)
Physical Properties
Color Green, yellowish green
Dash color White
Shine Glass
Transparency Transparent, translucent
Mohs hardness 7.5—8.0
fragility Fragile
Cleavage imperfect
kink Rough, uneven
Density 2.69-2.78 g/cm³
Crystallographic properties
space group P6/mmc
Syngony Hexagonal
Optical properties
optical type Single axle (-)
Refractive index nω = 1.564–1.595, nε = 1.568–1.602
Birefringence 0.005-0.009
optical relief Moderate
Dispersion of optical axes 0.014
Pleochroism Yellowish green to bluish
Luminescence Missing
Diffusion Excellent, 0.008

Strode Anna

Anna Strod – director of the jewelry online store Author and editor of the jewelry blog

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