Amblygonite

Refractive Index: 1.6000
Abbe Number: 65.0
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Approximate (from n, V)
Fits: 1

Refraction Fits

Fit #1— Cauchy from (n_D, V_D estimated from phosphate family)

Cauchy approximation

Valid 0.38–0.78 µm

$n$

n

= 1.6000

V_{D}

= 65.0

n (λ) = 1.5861 + 0.004832/ λ^{2}

Li-Al fluorophosphate. n_D from gem tables; dispersion not widely reported — estimated. n_D from published gemological tables; V_D estimated from phosphate family because species-specific dispersion is not widely reported. Source: Winchell / GIA / Liddicoat compilations.

Absorption Specimens

LED

SUN

Amblygonite

Myanmar, Mandalay Division, Mogok (Kyatpyin)