Cinnabar

Refractive Index: 2.9000
Abbe Number: 10.0
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

= 2.9000

V_{D}

= 10.0

n (λ) = 2.6135 + 0.099461/ λ^{2}

HgS; extreme dispersion. Approximate; seldom faceted. Data from Winchell. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

China, Hunan Province

China, Hunan Province

China, Hunan Province