Garnet

Spessartine

Refractive Index: 1.8017–1.8029
Abbe Number: 52.1–55.0
Crystal System: Isotropic (cubic)
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 2

Refraction Fits

Fit #1

Shannon / Cauchy

$n$

n

= 1.8029

V_{D}

= 55.0

n^{2} = 1 + \frac{λ ^{2}}{0.4599 ( λ ^{2} - 0.011742 )}

Fit #2— Specimen fit

Shannon / Cauchy

$n$

n

= 1.8017

V_{D}

= 52.1

n^{2} = 1 + \frac{λ ^{2}}{0.4616 ( λ ^{2} - 0.012348 )}

Absorption Specimens

Kenya, Eastern Province, Archer's Post

Namibia, Kunene Region, Kunene River

Nigeria, Oyo State, Ibadan

Sri Lanka, Sabaragamuwa Province

Sri Lanka, Sabaragamuwa Province

Sri Lanka, Sabaragamuwa Province, Ratnapura

United States, Virginia (Amelia County), Amelia