Scheelite

Refractive Index: 1.9200
Abbe Number: 25.0
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

= 1.9200

V_{D}

= 25.0

n (λ) = 1.8645 + 0.019264/ λ^{2}

Ca tungstate; very high dispersion. GIA dispersion 0.038. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

Mexico, Sonora State (Santa Cruz Municipality), Santa Cruz

Mexico, Sonora State (Santa Cruz Municipality), Santa Cruz

Sri Lanka, Sabaragamuwa Province, Godakawela