Smithsonite

Refractive Index: 1.7700
Abbe Number: 35.0
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

= 1.7700

V_{D}

= 35.0

n (λ) = 1.7368 + 0.011517/ λ^{2}

Zn carbonate. GIA dispersion 0.030. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

Namibia, Oshikoto Region, Tsumeb (Tsumeb Mine)

United States, Arizona (Gila County), Chilito (79 Mine)

United States, Arizona (Gila County), Chilito (79 Mine)

United States, New Mexico (Socorro County), Magdalena District (Kelly Mine)