Apatite

Refractive Index: 1.6338–1.6448
Abbe Number: 62.3–68.5
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 5

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.6352

V_{D}

= 64.3

n^{2} = 1 + \frac{λ ^{2}}{0.6147 ( λ ^{2} - 0.009761 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6338

V_{D}

= 62.3

n^{2} = 1 + \frac{λ ^{2}}{0.6169 ( λ ^{2} - 0.01005 )}

flourapatite (unknown source)

Fit #3— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6447

V_{D}

= 64.3

n^{2} = 1 + \frac{λ ^{2}}{0.6035 ( λ ^{2} - 0.009776 )}

fluorapatite (Zillertal, Tirol)

Fit #4— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6448

V_{D}

= 66.6

n^{2} = 1 + \frac{λ ^{2}}{0.6028 ( λ ^{2} - 0.009456 )}

fluorapatite Rotenkopf

Fit #5— Specimen fit

Shannon / Cauchy

$n$

n

= 1.6381

V_{D}

= 68.5

n^{2} = 1 + \frac{λ ^{2}}{0.6102 ( λ ^{2} - 0.009177 )}

fluorapatite Knappenwand

Absorption Specimens

Brazil, Minas Gerais State, Conselheiro Pena (Itatiaia Mine)

LED

SUN

Apatite

Brazil, Minas Gerais State, Conselheiro Pena (Itatiaia Mine)

Madagascar, Antananarivo Province (Vakinankaratra District), Mahaiza (Itongafeno)

LED

SUN

Apatite

Mexico, Durango State (Durango Municipality), Victoria de Durango (Cerro de Mercado Mine)

LED

SUN

Apatite

Mexico, Durango State (Durango Municipality), Victoria de Durango (Cerro de Mercado Mine)

Myanmar, Mandalay Division, Mogok (Kyatpyin)

LED

SUN

Apatite

Myanmar, Mandalay Division, Mogok (Kyatpyin)

United States, California (San Diego County), Mesa Grande

LED

SUN

Apatite

United States, Maine (Androscoggin County), Auburn (Mount Apatite - Pulsifer Quarry)

LED

SUN

Apatite

United States, Maine (Androscoggin County), Auburn (Mount Apatite - Pulsifer Quarry)

LED

SUN

Apatite

Zimbabwe, Mashonaland West Province (Karoi District), Karoi

LED

SUN

Apatite

Zimbabwe, Mashonaland West Province (Karoi District), Mwami