Materials
/
Danburite
Danburite
Refractive Index
1.6329–1.6332
Abbe Number
69.1
Crystal System
Isotropic (cubic)
Formation
Natural
Dispersion Data
Measured (published fit)
Fits
2
Refraction Fits
Fit #1
Shannon / Cauchy
n
n
=
1.6332
V
D
=
69.1
n
400
450
500
550
600
650
700
750
1.620
1.630
1.640
1.650
1.660
n
2
=
1
+
0.6159
(
λ
2
−
0.009092
)
λ
2
Fit #2
— Specimen fit
Shannon / Cauchy
n
n
=
1.6329
V
D
=
69.2
n
400
450
500
550
600
650
700
750
1.620
1.630
1.640
1.650
1.660
n
2
=
1
+
0.6162
(
λ
2
−
0.009088
)
λ
2
Charcus, Mexico
Absorption Specimens
LED
SUN
I
F
Danburite
Madagascar, Antananarivo Province (Vakinankaratra District), Ambohimanambola (Anjanabonoina Mine)
LED
SUN
I
F
Danburite
Madagascar, Antananarivo Province (Vakinankaratra District), Ambohimanambola (Anjanabonoina Mine)
LED
SUN
I
F
Danburite
Mexico, San Luis Potosí (Charcas Municipality), Charcas
LED
SUN
I
F
Danburite
Myanmar, Mandalay Division, Mogok (Kyatpyin)
LED
SUN
I
F
Danburite
Russia
LED
SUN
I
F
Danburite
Sri Lanka, Sabaragamuwa Province, Kolonne
LED
SUN
I
F
Danburite
Sri Lanka, Sabaragamuwa Province, Ratnapura
LED
SUN
I
F
Danburite
United States, Connecticut