Refractive Index Chart

Name    
Andalusite1.634 (± .006)1.643 (± .004)
Danburite1.630 (± .003)1.636 (± .003)
Datolite1.6261.67
Tourmaline1.624 (± .005)1.644 (± .006)
Smithsonite1.6211.849
Topaz1.619 (± .010)1.627 (± .010)
Prehnite1.6151.646
Turquoise1.611.65
Lazulite1.6121.643
Amblygonite1.6121.636
Bakelite1.61 (± .06)
Nephrite1.6061.632
Brazilianite1.6021.621
Odontolite1.60 (± .03)1.61 (± .03)
Ekanite1.597
Rhodochrosite1.5971.817
Verdite1.58
Beryl1.577 (± .016)1.583 (± .017)
Synthetic Emerald (Linde)1.5751.581
Augelite1.5741.588
Pseudophite1.571.58
Synthetic Emerald (Chatham)1.5611.565
Variscite1.561.59
Coral (black)1.561.57
Labradorite feldspar1.5591.568
Hambergite1.5551.625
Beryllonite1.5521.562
Agalmatolite1.551.66
Scapolite1.551.572
Quartz1.544 (± .00)1.533 (± .00)
Iolite1.542 (- .010, + .002)1.551 (- .011, + .015)
Steatite1.541.59
Amber1.54
Chalcedony quartz1.5351.539
Apophyllite1.5351.537
Albite-olioclase1.532 (± .007)1.542 (± .005)
Pollucite1.525
Microcline1.5221.53
Orthoclase1.5181.526
Thomsonite1.5151.54
Stichtite1.5161.542
Leucite1.508
Petalite1.5021.518
Lazurite (lapis-lazuli)1.5
Obsidian1.5
Lucite1.495 (± .005)
Serpentine1.56 (- .07)1.570 (- .07)
Calcite1.4861.658
Coral1.4861.658
Sodalite1.483 (± .003)
Moldavite1.48
Opal1.45 (- .080, + .020)
Fluorite1.434
Glass (normal)1.48 - 1.70
Glass (extreme)1.44 - 1.77
Rutile & Synthetic Rutile2.6162.903
Anatase2.4932.554
Diamond2.417
Strontium titanate2.409
Stibiotantalite2.372.45
Sphalerite2.37
Zincite2.0132.029
Cassiterite1.9972.093
Zircon (high)1.9251.984
Scheelite1.9181.934
Sphene1.900 (± .018)2.034 (± .20)
Zircon (medium)1.875 (± .045)1.905 (± .075)
Andradite garnet (Demantoid)1.875 (± .20)
Zircon (low)1.810 (± .020)1.815 (± .020)
Spessartite garnet (Spessertine)1.81 (± .010)
Alamandite garnet1.80 (± .030)
Gahnite1.8
Painite1.7871.816
Corundum1.762(- .003, + .007)1.770 (- .003, + .008)
Synthetic corundum1.7621.77
Rhodolite garnet1.76 (± .010)
Benioite1.7571.804
Gahnospinel1.76 (± .02)
Pyrope garnet1.746 (- .026, + .010)
Chrysoberyl1.746 (± .004)1.755 (± .005)
Staurolite1.7361.746
Grossularite garnet (Grossucular)1.735 (± .015)
Azurite1.73 (± .010)1.84 (± 0.10)
Rhodonite1.731.74
Epidote1.729 (- .015, + .006)1.768 (- .035, + .012)
Synthetic spinel1.73 (± .01)
Spinel1.718 (- .006, + .044)
Taafeite1.7191.723
Kyanite1.716 (± .004)1.731 (± .004)
Idocrase1.713 (± .012)1.718 (± .014)
Zoisite1.71.706
Willemite1.691.72
Rhodizite1.69
Dumortierite1.6781.689
Axinite1.6781.688
Diopside1.675 (- .010, + .027)1.701 (- .007, + .029)
Sinhalite1.668 (± .003)1.707 (± .003)
Kornerupine1.667 (± .002)1.680 (± .003)
Malachite1.661.91
Spodumene1.660 (± .005)1.676 (± .005)
Sillimanite1.6591.68
Jet1.66 (± .020)
Enstatite1.658 (± .005)1.668 (± .005)
Dioptase1.655 (± .011)1.708 (± .012)
Jadeite1.6541.667
Euclase1.654 (± .004)1.673 (± .004)
Phenakite1.654 (- .003, + .017)1.670 (- .004, + .026)
Peridot1.654 (± .020)1.690 (± .020)
Apatite1.642 (- .012, + .003)1.646 (- .014, + .005)