Euclase

Refractive Index: 1.6590–1.6602
Abbe Number: 69.8–72.7
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 3

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.6590

V_{D}

= 72.7

n^{2} = 1 + \frac{λ ^{2}}{0.5854 ( λ ^{2} - 0.008712 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6602

V_{D}

= 69.8

n^{2} = 1 + \frac{λ ^{2}}{0.5846 ( λ ^{2} - 0.009066 )}

San Sebastao de Maranhao, Minas Gerais

Fit #3— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6601

V_{D}

= 71.1

n^{2} = 1 + \frac{λ ^{2}}{0.5845 ( λ ^{2} - 0.008896 )}

Diamantina, Minas Gerais

Absorption Specimens

Brazil, Minas Gerais State, Ouro Preto

Brazil, Minas Gerais State, Ouro Preto (Dom Bosco Mine)

Zimbabwe, Mashonaland West Province (Karoi District), Mwami (Lost Hope Mine)

Zimbabwe, Mashonaland West Province (Karoi District), Mwami (Lost Hope Mine)