Zincite

Refractive Index: 2.0500
Abbe Number: 20.0
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Approximate (from n, V)
Fits: 1

Refraction Fits

Fit #1— Cauchy from (n_D, V_D)

Cauchy approximation

Valid 0.38–0.78 µm

$n$

n

= 2.0500

V_{D}

= 20.0

n (λ) = 1.9708 + 0.027483/ λ^{2}

ZnO; very high dispersion. GIA dispersion 0.127. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

United States, New Jersey (Sussex County), Franklin District