From The Gemology Project
Revision as of 13:48, 19 January 2007 by Tom Goodwin, G.G. (talk | contribs) ("localities")
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Chemical composition Be3Al2(SiO3)6 Beryllium aluminum silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Poor, basal
Fracture Conchoidal to uneven
Hardness 7.5
Optic nature Uniaxial -
Refractive index 1.57 - 1.59
Birefringence 0.004 - 0.009
Dispersion Low, 0.014
Specific gravity 2.7 - 2.9
Lustre Vitreous
Pleochroism None

Goshenite is the colorless variety of beryl and is named after Goshen in Hampshire County, Massachusetts, USA (one of the localities where this gem is found).