Bronzite

Refractive Index: 1.6800
Abbe Number: 55.0
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

= 1.6800

V_{D}

= 55.0

n (λ) = 1.6614 + 0.006472/ λ^{2}

Orthopyroxene (enstatite-ferrosilite series, Fe-rich end). GIA dispersion 0.019. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

Tanzania, Tanga Region, Umba Valley