Materials
/
Mimetite
Mimetite
Refractive Index
2.1378–2.1406
Abbe Number
18.2–18.3
Crystal System
Isotropic (cubic)
Formation
Natural
Dispersion Data
Measured (published fit)
Fits
2
Refraction Fits
Fit #1
Shannon / Cauchy
n
n
=
2.1406
V
D
=
18.3
n
400
450
500
550
600
650
700
750
2.100
2.150
2.200
2.250
2.300
n
2
=
1
+
0.3097
(
λ
2
−
0.034227
)
λ
2
Fit #2
— Specimen fit
Shannon / Cauchy
n
n
=
2.1378
V
D
=
18.2
n
400
450
500
550
600
650
700
750
2.100
2.150
2.200
2.250
2.300
n
2
=
1
+
0.3109
(
λ
2
−
0.034416
)
λ
2
Absorption Specimens
LED
SUN
I
F
Mimetite
Namibia, Oshikoto Region, Tsumeb