Beryl

Refractive Index: 1.5622–1.5751
Abbe Number: 66.5–69.3
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 5

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.5751

V_{D}

= 69.3

n^{2} = 1 + \frac{λ ^{2}}{0.6931 ( λ ^{2} - 0.008945 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.5669

V_{D}

= 68.2

n^{2} = 1 + \frac{λ ^{2}}{0.7056 ( λ ^{2} - 0.00907 )}

Santa Rita, Minas Gerais

Fit #3— Specimen fit

Shannon / Cauchy

$n$

n

= 1.5699

V_{D}

= 67.8

n^{2} = 1 + \frac{λ ^{2}}{0.7012 ( λ ^{2} - 0.009127 )}

Klein Spitzkopje, SW Africa : Light Blue

Fit #4— Specimen fit

Shannon / Cauchy

$n$

n

= 1.5637

V_{D}

= 66.5

n^{2} = 1 + \frac{λ ^{2}}{0.711 ( λ ^{2} - 0.009283 )}

synthetic-Chatham

Fit #5— Specimen fit

Shannon / Cauchy

$n$

n

= 1.5622

V_{D}

= 67.8

n^{2} = 1 + \frac{λ ^{2}}{0.713 ( λ ^{2} - 0.009116 )}

synthetic-Chatham

Absorption Specimens

LED

SUN

Beryl

Brazil, Bahia State, Brumado

LED

SUN

Beryl

Brazil, Minal Gerais State, Aracuai

LED

SUN

Beryl

Brazil, Minas Gerais State, Sabinópolis

LED

SUN

Beryl

Kenya, Eastern Province, Embu

Madagascar, Antananarivo Province (Itasy Region), Andranomiely

LED

SUN

Beryl

Sri Lanka, Sabaragamuwa Province, Ratnapura

LED

SUN

Beryl

Zimbabwe, Mashonaland West Province (Karoi District), Mwami