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This is a deduped, simplified version of the Maxwell IOR list.
Search through this for the IOR of specific materials.
I did not create this list, I just sorted it.
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Acetone 1.36
Acrylic glass 1.490 - 1.492
Actinolite 1.618
Agalmatoite 1.550
Agate 1.544 - 1.553
Agate, Moss 1.54
Air 1.0003
Air @ STP 1.0002926
Alcohol 1.329
Alcohol, Ethyl (grain) 1.36
Alcohol, Methyl (wood) 1.329
Alexandrite 1.745 - 1.755
All Purpose Orange Cleaner (Pathmark Brand) 1,293
Almandine 1.75 - 1.83
Aluminum 1.39 - 1.44
Amber 1.539 - 1.546
Amblygonite 1.611
Amethyst 1.532 - 1.554
Ammolite 1.52 -1.68
Anatase 2.490
Andalusite 1.629 - 1.650
Andradite 1.887
Anhydrite 1.571
Apatite 1.624- 1.667
Apophyllite 1.536
Aquamarine 1.567-1.590
Aragonite 1.530 - 1.686
Argon 1.000281
Asphalt 1.635
Augelite 1.574
Axenite 1.674 - 1.704
Azurite 1.730
Baby Wash 1.26
Barite 1.636
Barite 1.636 - 1.648
Barytocalcite 1.684
Beer 1.345
Benitoite 1.757
Benzene 1.501
Beryl 1.565 - 1.598
Beryllonite 1.553
Beryl, Red 1.570 - 1.598
Brazilianite 1.603
Bromine 1.661
Bronze 1.18
Brownite 1.567
Calcite 1.486 - 1.740
Calspar 1.486
Cancrinite 1.491
Carbonated Beverages 1.34 - 1.356
Carbon Dioxide 1.000449 - 1.000450
Carbon Disulfide 1.628
Carbon Tetrachloride 1.460
Cassiterite 1.997
Celestite 1.622
Cerussite 1.804 - 2.079
Ceylanite 1.770
Chalcedony 1.530 - 1.553
Chalk 1.510
Chalybite 1.630
Chlorine (gas) 1.000768
Chlorine (liq) 1.385
Chrome Green 2.4
Chrome Red 2.42
Chrome Tourmaline, 1.61 - 1.64
Chrome Yellow 2.31
Chromium 2.97
Chrysoberyl 1.745 - 1.756
Chrysocolla 1.500
Chrysoprase 1.534
Cinnabar (Mercury sulfide) 3.02
Citrine 1.532 - 1.554
Clinohumite 1.625 - 1.675
Clinozoisite 1.724
Cobalt Blue 1.74
Cobalt Green 1.97
Cobalt Violet 1.71
Colemanite 1.586
Copper 1.1 - 2.43
Copper Oxide 2.705
Coral 1.486 - 1.658
Cordierite 1.540
Corundum 1.759 - 1.772
Cranberry Juice (25%) 1.351
Crocoite 2.310
Crown Glass 1.52
Crown Glass (impure) 1.485 - 1.755
Crown Glass (pure) 1.50 - 1.54
Cryolite 1.338
Crysoberyl, Catseye 1.746 - 1.755
Crystal 2.000
Cubic Zirconia 2.15 - 2.18
Cuprite 2.850
Danburite 1.627 - 1.641
Degreaser 1.377
Dense Flint Glass 1.66
Diamond 2.417 - 2.419
Diopside 1.680
Dolomite 1.503
Dumortierite 1.686
Ebonite 1.66
Ekanite 1.600
Elaeolite 1.532
Emerald 1.560 - 1.605
Emerald Catseye 1.560 - 1.605
Emerald, Synth flux 1.561
Emerald, Synth hydro 1.568
Enstatite 1.663
Epidote 1.733
Ethanol 1.36
Ethyl Alcohol 1.36
Euclase 1.652
Eye, Aqueous humor 1.33
Eye, Cornea 1.38
Eye, Lens 1.41
Eye, Vitreous humor 1.34
Fabulite 2.409
Feldspar, Adventurine 1.532
Feldspar, Albite 1.525
Feldspar, Amazonite 1.525
Feldspar, Labradorite 1.565
Feldspar, Microcline 1.525
Feldspar, Oligoclase 1.539
Feldspar, Orthoclase 1.525
Flint glass (impure) 1.523 - 1.925
Flint glass (pure) 1.60 - 1.62
Fluoride 1.56
Fluorite 1.434
Formica 1.47
Gallium(III) arsenide 3.927
Gallium(III) phosphide 3.5
Gallium phosphide 3.50
Garnet, Almandine 1.760
Garnet, Almandite 1.790
Garnet, Andradite 1.820 - 1.94
Garnet, Demantiod 1.880 - 1.9
Garnet, Grossular 1.72 - 1.80
Garnet, Hessonite 1.745
Garnet, Mandarin 1.790 - 1.8
Garnet, Pyrope 1.73 - 1.76
Garnet, Rhodolite 1.740 - 1.770
Garnet, Spessartite 1.810
Garnet, Tsavorite 1.739 - 1.744
Garnet, Uvarovite 1.74 - 1.87
Gaylussite 1.517
Glass 1.51714
Glass, Albite 1.4890
Glass, Arsenic Trisulfide 2.04
Glass, Crown 1.520
Glass, Crown (common) 1.52
Glass, Crown, Zinc 1.517
Glass, Flint, 29% lead 1.569
Glass, Flint, 55% lead 1.669
Glass, Flint, 71% lead 1.805
Glass, Flint, Dense 1.66
Glass, Flint, Heaviest 1.89
Glass, Flint, Heavy 1.65548
Glass, Flint, Lanthanum 1.80
Glass, Flint, Light 1.58038
Glass, Flint, Medium 1.62725
Glass, Fused Silica 1.459
Glass, Pyrex 1.474
Glycerin 1,367 - 1.473
Glycerol 1.4729
Gold 0.166 - 0.47
Grossularite 1.734
Gypsum 1.519 - 1.531
Halite 1.544
Hambergite 1.559
Hauyn 1.490 - 1.505
Hauynite 1.502
Helium 1.000036
Hematite 2.940
Hemimorphite 1.614
Hiddenite 1.655
Honey, 13% water content 1.504
Honey, 17% water content 1.494
Honey, 21% water content 1.484
Howlite 1.586
Hydrogen (gas) 1.000140
Hydrogen (liq) 1.0974
Hypersthene 1.670
Ice 1.309 - 1.310
Idocrase 1.713
Iodine Crystal 3.34
Iolite 1.522 - 1.578
Iron 1.51
Ivory 1.540
Jadeite 1.665
Jade, Jadeite 1.64 - 1.667
Jade, Nephrite 1.600 - 1.641
Jasper 1.540
Jet 1.660
Kornerupine 1.665
Kunzite 1.655 - 1.676
Kyanite 1.715
Labradorite 1.560 - 1.572
Lapis Gem 1.500
Lapis Lazuli 1.50 - 1.61
Lazulite 1.615
Lead 2.01
Leucite 1.509
Light Flint Glass 1.58
Liquid Hydrogen 1.0974
Liquid Nitrogen 1.2053
Liquid Water (20°C) 1.332986
Lucite 1.495
Magnesite 1.515
Malachite 1.655
Meerschaum 1.530
Mercury (liq) 1.62
Methanol 1.329
Microcline 1.514 - 1.539
Milk 1.35
Moissanite 2.65 - 2.69
Moldavite 1.5
Moldavite 1.500
Moonstone 1.518 - 1.526
Moonstone, Adularia 1.525
Moonstone, Albite 1.535
Morganite 1.585 - 1.594
Mylar 1.65
Natrolite 1.480
Nephrite 1.600
Nickel 1.08
Nitrogen (gas) 1.000297
Nitrogen (liq) 1.2053
Nylon 1.53
Obsidian 1.489 - 1.500
Oil, Clove 1.535
Oil, Lemon 1.481
Oil, Neroli 1.482
Oil of Wintergreen 1.536
Oil, Orange 1.473
Oil, Safflower 1.466
Oil, vegetable (50° C) 1.47
Olivine 1.63 - 1.88
Onyx 1.486
Opal 1.41 - 1.46
Opal, Black 1.440 - 1.460
Opal, Fire 1.430 - 1.460
Opal, White 1.440 - 1.460
Oregon Sunstone 1.560 - 1.572
Oxygen (gas) 1.000276
Oxygen (liq) 1.221
Padparadja 1.760 - 1.773
Painite 1.787
Pearl 1.53 - 1.69
Periclase 1.740
Peridot 1.635 - 1.690
Peristerite 1.525
PET 1.5750
Petalite 1.502
PETg 1.57
Phenakite 1.650
Phosgenite 2.117
Plastic 1.460 - 1.55
Platinum 2.33
Plexiglass 1.488 - 1.501
PMMA 1.4893 - 1.4899
Polycarbonate 1.584 - 1.586
Polystyrene 1.55
Prase 1.540
Prasiolite 1.540
Prehnite 1.610
Proustite 2.790
Purpurite 1.840
Pyrite 1.810
Pyrope 1.74
Pyrope 1.740
Quartz 1.45843 - 1.553
Quartz, Fused 1.45843
Rhodizite 1.690
Rhodochrisite 1.600
Rhodochrosite 1.597 - 1.816
Rhodonite 1.735
Rock salt 1.516 - 1.544
Rubber, Natural 1.5191
Ruby 1.757 - 1.779
Rum, White 1.361
Rutile 2.605 - 2.907
Salt 1.516
Salt (NaCl) 1.544
Sanidine 1.522
Sapphire 1.757 - 1.779
Sapphire, Star 1.760 - 1.773
Scapolite 1.540 - 1.600
Scapolite, Yellow 1.555
Scheelite 1.920
Selenium, Amorphous 2.92
Serpentine 1.560
Shampoo 1.362
Shell 1.530
Shower Gel 1.51
Silicon 4.01 - 4.24
Sillimanite 1.658
Silver 0.18 - 1.35
Sinhalite 1.699
Smaragdite 1.608
Smithsonite 1.621
Sodalite 1.483 - 1.487
Sodium Chloride 1.544
Spessarite 1.79 - 1.81
Spessartine 1.800
Sphalerite 2.368 - 2.369
Sphene 1.843 - 2.110
Spinel 1.712 - 1.719
Spinel, Blue 1.712 - 1.747
Spinel, Red 1.708 - 1.735
Spodumene 1.650
Star Ruby 1.76 - 1.773
Staurolite 1.739
Steatite 1.539
Steel 2.50
Stichtite 1.520
Strontium Titanate 2.410
Styrofoam 1.595
Sugar Solution 30% 1.38
Sugar Solution 80% 1.49
Sulphur 1.960
Synthetic Spinel 1.730
Taaffeite 1.720
Tantalite 2.240
Tanzanite 1.690-1.700
Teflon 1.35 - 1.38
Thomsonite 1.530
Tiger eye 1.544
Titanium 2.16
Topaz 1.606 - 1.638
Topaz, Blue 1.610
Topaz, Imperial 1.605-1.640
Topaz, Pink 1.620
Topaz, White 1.630
Topaz, Yellow 1.620
Tourmaline 1.603 - 1.675
Tourmaline, Blue 1.61 - 1.64
Tourmaline, Catseye 1.61 - 1.64
Tourmaline, Green 1.61 - 1.64
Tourmaline, Paraiba 1.61 - 1.65
Tourmaline, Red 1.61 - 1.64
Tremolite 1.600
Tugtupite 1.496
Turpentine 1.472
Turquoise 1.610
Ulexite 1.49
Ulexite 1.490
Uvarovite 1.87
Uvarovite 1.870
Vaccuum 1.000000
Variscite 1.550
Vivianite 1.580
Vodka 1.363
Wardite 1.590
Water (0° C) 1.33346
Water (100° C) 1.31766 - 1.31819
Water 1.333
Water (20° C) 1.33283 - 1.33335
Water 35'C (Room temp) 1.33157
Water at 00C 1.309
Water (gas) 1.000261
Water Ice 1.31
Whisky 1.356
Willemite 1.690
Witherite 1.532
Wulfenite 2.300
Zincite 2.010
Zircon 1.777 - 2.015
Zircon, High 1.960
Zirconia, Cubic 2.170 - 2.21
Zircon, Low 1.800