Cassiterite

Refractive Index: 2.0167–2.0303
Abbe Number: 26.1–27.3
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 2

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 2.0303

V_{D}

= 27.3

n^{2} = 1 + \frac{λ ^{2}}{0.3436 ( λ ^{2} - 0.023574 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 2.0167

V_{D}

= 26.1

n^{2} = 1 + \frac{λ ^{2}}{0.3508 ( λ ^{2} - 0.024515 )}

synthetic

Absorption Specimens

China, Yunnan Province (Pu'er Prefecture), Ximeng