Thanks!
medium blue sapphire.
Data from:
http://minerals.gps.caltech.edu/FILES/Visible/index.htm
data:
4 352.2 802.2 90
1.799000000000 0.000000365
1.799000000000 0.000000311
1.799000000000 0.000000264
1.793000000000 0.000000254
1.791000000000 0.000000258
1.791000000000 0.000000340
1.791000000000 0.000000330
1.794000000000 0.000000340
1.796000000000 0.000000280
1.799000000000 0.000000199
1.797000000000 0.000000153
1.793000000000 0.000000136
1.788000000000 0.000000130
1.784000000000 0.000000129
1.782000000000 0.000000131
1.783000000000 0.000000136
1.786000000000 0.000000146
1.789000000000 0.000000164
1.791000000000 0.000000192
1.785000000000 0.000000223
1.782000000000 0.000000261
1.780000000000 0.000000236
1.777000000000 0.000000221
1.775000000000 0.000000200
1.773000000000 0.000000197
1.771000000000 0.000000184
1.770000000000 0.000000182
1.768000000000 0.000000187
1.767000000000 0.000000197
1.766000000000 0.000000209
1.765000000000 0.000000223
1.764000000000 0.000000239
1.763000000000 0.000000255
1.762000000000 0.000000271
1.762000000000 0.000000288
1.761000000000 0.000000305
1.761000000000 0.000000321
1.761000000000 0.000000337
1.762000000000 0.000000353
1.762000000000 0.000000367
1.763000000000 0.000000381
1.764000000000 0.000000394
1.765000000000 0.000000405
1.765000000000 0.000000415
1.766000000000 0.000000424
1.766000000000 0.000000432
1.767000000000 0.000000439
1.768000000000 0.000000444
1.768000000000 0.000000449
1.769000000000 0.000000454
1.769000000000 0.000000457
1.769000000000 0.000000461
1.768000000000 0.000000465
1.768000000000 0.000000470
1.768000000000 0.000000474
1.768000000000 0.000000479
1.767000000000 0.000000484
1.767000000000 0.000000491
1.767000000000 0.000000497
1.767000000000 0.000000505
1.767000000000 0.000000513
1.767000000000 0.000000522
1.767000000000 0.000000531
1.766000000000 0.000000542
1.766000000000 0.000000553
1.766000000000 0.000000565
1.766000000000 0.000000578
1.765000000000 0.000000591
1.765000000000 0.000000606
1.765000000000 0.000000620
1.764000000000 0.000000637
1.763000000000 0.000000653
1.763000000000 0.000000671
1.762000000000 0.000000691
1.762000000000 0.000000710
1.761000000000 0.000000731
1.761000000000 0.000000753
1.760000000000 0.000000774
1.760000000000 0.000000799
1.760000000000 0.000000823
1.759000000000 0.000000848
1.759000000000 0.000000876
1.758000000000 0.000000902
1.758000000000 0.000000929
1.757000000000 0.000000959
1.757000000000 0.000000988
1.756000000000 0.000001014
1.756000000000 0.000001045
1.755000000000 0.000001075
1.755000000000 0.000001101
1.754000000000 0.000001131
S.L.: 21
Render cost:
MEDIUM
Remarks: k values calculated from absorbance values to the best of my knowledge (that's not saying much). N values conjectural. Some anormalous dispersion added near absorption maxima. I think getting the exact refraction at all frequencies is not crititcal with coloured dielectrics, since many frequencies are absorbed and dispersion is not likely to show anyway. Unlike any other transparent ior material so far, this one has no "0 absorption band". That implies that even blue light is attenuated, so it should be checked at various scales. Ruby and emerald materials should not be scale dependant.