Difference between revisions of "Goshenite"
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− | | | + | [[File:Béryl_var._goshénite_1_(Chine)_.jpg|left|thumb|500px| Colorless Goshenite<br /> Xuebaoding, Pingwu, Sichuan Province, China]] |
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− | + | 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). |
Latest revision as of 19:40, 12 November 2012
Goshenite | |
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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).