Petalite

Refractive Index: 1.5124
Abbe Number: 72.7
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 1

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.5124

V_{D}

= 72.7

n^{2} = 1 + \frac{λ ^{2}}{0.7961 ( λ ^{2} - 0.008416 )}

Absorption Specimens

Brazil, Minas Gerais State

Brazil, Minas Gerais State

Brazil, Minas Gerais State, Itinga