Haüyne

Refractive Index: 1.5000
Abbe Number: 50.0
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

= 1.5000

V_{D}

= 50.0

n (λ) = 1.4849 + 0.005235/ λ^{2}

Feldspathoid (sodalite group). GIA dispersion 0.018. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

Germany, Rheinland-Palatinate State, Eifel Mountains