Witherite

Refractive Index: 1.7000
Abbe Number: 30.0
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

= 1.7000

V_{D}

= 30.0

n (λ) = 1.6648 + 0.012214/ λ^{2}

Ba carbonate. GIA dispersion 0.032. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens