Quartz

Amethyst

Refractive Index: 1.5473–1.5474
Abbe Number: 69.8
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 2

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.5474

V_{D}

= 69.8

n^{2} = 1 + \frac{λ ^{2}}{0.7359 ( λ ^{2} - 0.008833 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.5473

V_{D}

= 69.8

n^{2} = 1 + \frac{λ ^{2}}{0.736 ( λ ^{2} - 0.008832 )}

Absorption Specimens

Brazil, Bahia State

Zimbabwe, Matabeleland North Province, Hwange