Actinolite

Nephrite

Refractive Index: 1.6150
Abbe Number: 95.0
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Approximate (from n, V)
Fits: 1

Refraction Fits

Fit #1— Cauchy from (n_D, V_D) — isotropic approximation of cryptocrystalline aggregate

Cauchy approximation

Valid 0.38–0.78 µm

$n$

n

= 1.6150

V_{D}

= 95.0

n (λ) = 1.6052 + 0.003389/ λ^{2}

Dispersion 0.011 from GIA tables; n_D 1.615 for tremolite-actinolite solid solution (nephrite jade). No published Sellmeier.

Absorption Specimens

Switzerland, Grabünden Canton, Poschiavo