Fluorite

Refractive Index: 1.4336–1.4338
Abbe Number: 78.6–95.0
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 2

Refraction Fits

Fit #1— Malitson 1963

Sellmeier

Valid 0.23–9.7 µm

$n$

n

= 1.4338

V_{D}

= 95.0

n^{2} = 1 + \frac{0.567589 λ ^{2}}{λ ^{2} - 0.002526} + \frac{0.471091 λ ^{2}}{λ ^{2} - 0.010078} + \frac{3.848472 λ ^{2}}{λ ^{2} - 1.201 e + 3}

I.H. Malitson, "A redetermination of some optical properties of calcium fluoride," Appl. Opt. 2, 1103–1107 (1963)

Fit #2— Specimen Cauchy fit

Shannon / Cauchy

$n$

n

= 1.4336

V_{D}

= 78.6

n^{2} = 1 + \frac{λ ^{2}}{0.9689 ( λ ^{2} - 0.007638 )}

Absorption Specimens

Namibia, Otjozondjupa Region, Otjiwarongo District (Okorusu Mine)

Switzerland, Uri Canton, Göschener Alp

LED

SUN

Fluorite

Switzerland, Uri Canton, Göschener Alp

United States, Illinois (Hardin County), Rosiclare

Color change