Beryl

Goshenite

Refractive Index: 1.5759
Abbe Number: 68.1
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 1

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.5759

V_{D}

= 68.1

n^{2} = 1 + \frac{λ ^{2}}{0.6922 ( λ ^{2} - 0.009101 )}

Absorption Specimens

Sri Lanka, Central Province, Nawalapitiya