Spodumene

Refractive Index: 1.6667–1.6670
Abbe Number: 65.3–67.7
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 2

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.6667

V_{D}

= 67.7

n^{2} = 1 + \frac{λ ^{2}}{0.578 ( λ ^{2} - 0.009343 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6670

V_{D}

= 65.3

n^{2} = 1 + \frac{λ ^{2}}{0.5783 ( λ ^{2} - 0.009684 )}