Materials
/
Dioptase
Dioptase
Refractive Index
1.6737–1.6767
Abbe Number
38.3–54.4
Crystal System
Isotropic (cubic)
Formation
Natural
Dispersion Data
Measured (published fit)
Fits
2
Refraction Fits
Fit #1
Shannon / Cauchy
n
n
=
1.6737
V
D
=
38.3
n
400
450
500
550
600
650
700
750
1.660
1.680
1.700
1.720
n
2
=
1
+
0.5822
(
λ
2
−
0.016146
)
λ
2
Fit #2
— Specimen fit
Shannon / Cauchy
n
n
=
1.6767
V
D
=
54.4
n
400
450
500
550
600
650
700
750
1.660
1.670
1.680
1.690
1.700
1.710
n
2
=
1
+
0.5711
(
λ
2
−
0.011557
)
λ
2
Kirgensteppe
Absorption Specimens
LED
SUN
I
F
Dioptase
Namibia, Oshikoto Region, Tsumeb (Tsumeb Mine)
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