Garnet

Pyrope-Spessartine

Refractive Index: 1.7700
Abbe Number: 32.0
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}

= 32.0

n (λ) = 1.7337 + 0.012596/ λ^{2}

Intermediate Pyrope-Spessartine solid solution (malaya garnet). GIA dispersion 0.024. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

Pyrope-Spessartine

Pyrope-Spessartine

Tanzania, Tanga Region, Umba Valley