Materials
/
Willemite
Willemite
Refractive Index
1.6987–1.7033
Abbe Number
42.7–48.4
Crystal System
Isotropic (cubic)
Formation
Natural
Dispersion Data
Measured (published fit)
Fits
2
Refraction Fits
Fit #1
Shannon / Cauchy
n
n
=
1.6987
V
D
=
42.7
n
400
450
500
550
600
650
700
750
1.680
1.700
1.720
1.740
n
2
=
1
+
0.5537
(
λ
2
−
0.014629
)
λ
2
Fit #2
— Specimen fit
Shannon / Cauchy
n
n
=
1.7033
V
D
=
48.4
n
400
450
500
550
600
650
700
750
1.700
1.720
1.740
n
2
=
1
+
0.5464
(
λ
2
−
0.012994
)
λ
2
Absorption Specimens
LED
SUN
I
F
Willemite
Namibia, Oshikoto Region, Tsumeb (Tsumeb Mine)
LED
SUN
I
F
Willemite
United States, New Jersey (Sussex County), Franklin District
LED
SUN
I
F
Willemite
United States, New Jersey (Sussex County), Franklin District
LED
SUN
I
F
Willemite
United States, New Jersey (Sussex County), Franklin District
LED
SUN
I
F
Willemite
United States, New Jersey (Sussex County), Franklin District