/////////////////////////////////////////////////
//                   GASES                     //
/////////////////////////////////////////////////
#declare Air_STP_IOR = 1.00029;
#declare Air_IOR = 1.000292;
#declare Liquid_Carbon_Dioxide_IOR = 1.20;
#declare Vacuum_IOR = 1.00000;


/////////////////////////////////////////////////
//                  GLASS                      //
/////////////////////////////////////////////////
#declare Amorphous_Selenium_IOR = 2.920; // Red glass
#declare Crown_Glass_IOR_1 = 1.510;
#declare Crown_Glass_IOR_2 = 1.520;
#declare Crown_Glass_Blue_IOR = 1.528;
#declare Crown_Glass_Green_IOR = 1.519;
#declare Crown_Glass_Red_IOR = 1.513;
#declare Crown_Glass_Orange_IOR = 1.514;
#declare Crown_Glass_Yellow_IOR = 1.517;
#declare Crown_Glass_Violet_IOR = 1.532;
#declare Crown_Glass_Zinc_IOR = 1.517;
#declare Flint_Glass_IOR = 1.710;
#declare Flint_Glass_Heaviest_IOR = 1.890;
#declare Flint_Glass_Heavy_IOR = 1.650;
#declare Flint_Glass_Light_IOR = 1.575;
#declare Glass_IOR = 1.500;


/////////////////////////////////////////////////
//          GEM-STONES, CRYSTALLS etc.         //
/////////////////////////////////////////////////
#declare Albite_IOR = 1.53; // Sodium Aluminum Silicate
#declare Alexandrite_IOR = (1.745 + 1.757) / 2; // a color changing variety of chrysoberyl, yellow, yellow-green, red in artificial light.
#declare Almandine_IOR = 1.83; // Iron Aluminum Silicate
#declare Amber_1_IOR = 1.546;
#declare Amber_2_IOR = (1.53 + 1.54) / 2; // 1.53-1.54
#declare Amblygonite_1_IOR = 1.61; // Lithium Sodium Aluminum Phosphate Fluoride Hydroxide
#declare Amblygonite_2_IOR = 1.64; // Lithium Sodium Aluminum Phosphate Fluoride Hydroxide
#declare Amethyst_IOR = (1.544 + 1.553) / 2; // a gemstone variety of quartz
#declare Andalusite_IOR = (1.632 + 1.638) / 2; // Aluminum Silicate
#declare Andesine_IOR = 1.545 + 1.562 / 2; // Sodium Calcium Aluminum Silicate
#declare Andradite_IOR = 1.89; // Calcium Iron Silicate
#declare Anglesite_IOR = 1.88; // Lead Sulfate
#declare Anorthite_IOR = (1.575 + 1.591) / 2; // Calcium Aluminum Silicate
#declare Aquamarine_IOR = (1.57 + 1.60) / 2; // the blue gemstone variety of beryl
#declare Aragonite_IOR = 1.7; // CaCO3, Calcium Carbonate, a cousin to calcite. Color can be white or colorless or with usually subdued shades of red, yellow, orange, brown, green and even blue. Luster is vitreous to dull
#declare Arfvedsonite_IOR = 1.69; // Sodium Iron Magnesium Silicate Hydroxide
#declare Bariumdifluorid_IOR = 1.470; // BaF2
#declare Beryll_1_IOR = (1.568 + 1.602) / 2; //
#declare Beryll_2_IOR = (1.564 + 1.595) / 2; // 
#declare Bideauxite_IOR = 2.192; // Lead Silver Chloride Fluoride Hydroxide
#declare Birusa_1_IOR = 1.650; // Bright blue and green
#declare Birusa_2_IOR = 1.620; // The name have been transcribed from Russian. Anyone knows its English name?
#declare Birusa_3_IOR = 1.610; //
#declare Brazilianite_IOR = (1.60 + 1.62) / 2; // Sodium Aluminum Phosphate Hydroxide
#declare Burbankite_IOR = (1.615 + 1.627) / 2; // Sodium Calcium Strontium Barium Cerium Carbonate
#declare Bytownite_IOR = (1.565 + 1.585) / 2; // Calcium Sodium Aluminum Silicate
#declare Cadmium_sulfide_IOR = 2.340; // CdS. Greenockite
#declare Calcite_1_IOR = 1.49; // Calcium Carbonate, CaCO3. Double refraction!
#declare Calcite_2_IOR = 1.66; // Calcium Carbonate, CaCO3. Double refraction!
#declare Calciumdifluorid_IOR = 1.430; // CaF2
#declare Calspar_1_IOR = 1.660;
#declare Calspar_2_IOR = 1.486;
#declare Cassiterite_IOR = 2.0; // approximately, Tin Oxide
#declare Chalcedony_1_IOR = (1.539 + 1.544) / 2; // 
#declare Chalcedony_2_IOR = (1.526 + 1.535) / 2; //
#declare Citrine_IOR = (1.544 + 1.553) / 2; // the yellow variety of quartz
#declare Coesite_IOR = 1.59; // approximately, Silicon Dioxide
#declare Cordierite_IOR = (1.52 + 1.57) / 2; // Magnesium Aluminum Silicate
#declare Corundum_IOR = 1.750; // Aluminium oxide/Al2O3. Ionic crystal. Commonly Al2O3 contains small amounts of impurities that produce beautiful colored crystals. Cr(3+)-containing Al2O3 constitutes ruby (red color). Ti(4+) impurities produce blue crystals and are a variety of blue sapphire.
#declare Cristobalite_IOR = 1.48; //approximately, Silicon Dioxide
#declare Crocoite_IOR = 2.36; // Lead Chromate
#declare Cryolite_IOR = 1.338; // Sodium Aluminum Fluoride
#declare Crystal_IOR = 2.000;
#declare Demantoid_IOR = 1.89; // a gemstone variety of andradite garnet
#declare Diamond_1_IOR = 2.470;
#declare Diamond_2_IOR = 2.417;
#declare Dioptase_IOR = (1.65 + 1.71) / 2; // CuSiO3-H2O, Hydrated copper silicate
#declare Emerald_IOR = (1.57 + 1.60) / 2; // The green gemstone variety of beryl, Be3Al2Si6O18
#declare Enstatite_IOR = 1.65; // approximately, Magnesium Silicate
#declare Eucryptite_IOR = 1.55; // Lithium Aluminum Silicate
#declare Fluorite_IOR = 1.434; // Colorless
#declare Fused_Quartz_IOR = 1.460; // SiO2
#declare Gadolinite_IOR = 1.79; // Yttrium Iron Beryllium Silicate
#declare Goshenite_IOR = (1.57 + 1.60) / 2; // A gemstone variety of beryl, Colorless, Be3Al2Si6O18
#declare Granat_IOR = (1.705 + 1.805) / 2; //
#declare Greenockite_IOR = (2.50 + 2.52) / 2; // Cadmium Sulfide
#declare Grossular_IOR = 1.75; // Calcium Aluminum Silicate
#declare Hedyphane_IOR = 1.95; // Lead Calcium Arsenate Chloride
#declare Heliodor_IOR = (1.57 + 1.60) / 2; // a gemstone variety of beryl
#declare Hessonite_IOR = (1.73 + 1.75) / 2; // a gemstone variety of grossular garnet
#declare Hiddenite_IOR = 1.66; // a green color variety of the mineral spodumene
#declare Hypersthene_IOR = (1.69 + 1.77) / 2; // approximately, Magnesium Iron Silicate
#declare Ice_IOR = 1.309; // Frozen H2O
#declare Indicolite_1_IOR = 1.62; // the blue variety of elbaite
#declare Indicolite_2_IOR = 1.68; // the blue variety of elbaite
#declare Iodine_Crystal_IOR = 3.340;
#declare Iolite_IOR = (1.52 + 1.57) / 2; // the gemstone variety of cordierite
#declare Jade_IOR = (1.66 + 1.62) / 2; // The name is used for 2 different minerals, Jadeite and Nephrite. They are different. The IOR here is the average of those two. It's better to use the values for Jadeite or Nephrite.
#declare Jadeite_IOR = 1.66; // Commonly known as jade (see Jade)
#declare Kornerupine_1_IOR = 1.66; // Magnesium Aluminum Iron Boro+silicate Hydroxide
#declare Kornerupine_2_IOR = 1.69; // Magnesium Aluminum Iron Boro+silicate Hydroxide
#declare Kunzite_IOR = 1.66; // the pink variety of spodumene
#declare Labradorite_IOR = (1.55 + 1.75) / 2; // Calcium Sodium Aluminum Silicate
#declare Lapis_Lazuli_IOR = 1.610;
#declare Lazurite_IOR = (1.495 + 1.501) / 2; // Sodium Calcium Aluminum Silicate Sulfur Sulfate
#declare Lapis_IOR = Lazurite_IOR;
#declare Lapis_Lazuli_IOR = Lazurite_IOR;
#declare Lithiumfluoride_IOR = 1.390; // LiF
#declare Magnesium_oxide_IOR = 1.700; // MgO. Ionic crystal.
#declare Magnesiumdifluorid_IOR = 1.380; // MgF2
#declare Malakhit_1_IOR = 1.9091; // Green-black
#declare Malakhit_2_IOR = 1.875; //
#declare Malakhit_3_IOR = 1.655; //
#declare Mimetite_IOR = 2.13; // Lead Chloroarsenate
#declare Moissanite_IOR = (2.6 + 2.7) / 2; // Silicon Carbide
#declare Morganite_IOR = (1.57 + 1.60) / 2; // the pink gemstone variety of beryl
#declare Narsarsukite_1_IOR = (1.601 + 1.614) / 2; // Sodium Titanium Iron Silicate Fluoride
#declare Narsarsukite_2_IOR = (1.632 + 1.647) / 2; // Sodium Titanium Iron Silicate Fluoride
#declare Nephrite_IOR = 1.62; // Commonly known as jade (see Jade)
#declare Obsidian_IOR = 1.482;
#declare Oligoclase_IOR = (1.533 + 1.552) / 2; // Sodium Calcium Aluminum Silicate
#declare Olivin_1_IOR = 1.670; // Colorless, yellow, green, black
#declare Olivin_2_IOR = 1.651;
#declare Olivin_3_IOR = 1.685;
#declare Olivine_IOR = (1.64 + 1.70) / 2; // Magnesium Iron Silicate
#declare Opal_IOR = (1.40 + 1.46) / 2;
#declare Peridot_IOR = (1.630 + 1.695) / 2; // A gemstone variety of olivine
#declare Phenakite_IOR = 1.66; // Beryllium Silicate
#declare Potassium_Aluminia_IOR = 1.456; // (KAl[SO4]2*12H20) colorless
#declare Potassium_di_H_orthophosphate_IOR = 1.500; // KH2PO4
#declare Potassiumbromide_IOR = 1.560; // KBr
#declare Potassiumchloride_IOR = 1.490; // KCl
#declare Potassiumfluorid_IOR = 1.360; // KF
#declare Pyromorphite_IOR = 2.05; // Lead Chlorophosphate
#declare Pyrope_IOR = 1.73; // Magnesium Aluminum Silicate
#declare Quartz_IOR = (1.544 + 1.553) / 2; // the colorless variety of quartz
#declare Quartz_Milky_IOR = Quartz_IOR; // the pink variety of quartz
#declare Quartz_Rose_IOR = Quartz_IOR; // the pink variety of quartz
#declare Quartz_Smoky_IOR = Quartz_IOR; // the black or brown variety of quartz
#declare Rhodizite_IOR = 1.69; // Potassium Cesium Beryllium Aluminum Borate
#declare Rhodonit_1_IOR = (1.723 + 1.732) / 2; // Dark pink.
#declare Rhodonit_2_IOR = (1.716 + 1.741) / 2; // Dark pink.
#declare Rhodonit_3_IOR = (1.711 + 1.738) / 2; // Dark pink.
#declare Rock_Crystal_IOR = Quartz_IOR; // the colorless variety of quartz
#declare Ruby_IOR = (1.76 + 1.78) / 2; // A variety of Corundum
#declare Rutile_IOR = 2.63; // Titanium Oxide, Pale yellow
#declare Rhutil_IOR = Rutile_IOR; // Titanium Oxide, Pale yellow
#declare Sapphire_IOR = (1.76 + 1.78) / 2; // A variety of Corundum
#declare Scapolite_IOR = (1.54 + 1.60) / 2; // Calcium Sodium Aluminum Silicate Carbonate Chloride Sulfate
#declare Silicon_Oxide_1_IOR = Quartz_IOR; // SiO2 / Quartz
#declare Silvin_IOR = 1.490; // (KCl) colorless
#declare Sodium_Chloride_Salt_1_IOR = 1.544; // NaCl, tablesalt
#declare Sodium_Chloride_Salt_2_IOR = 1.644; // NaCl, tablesalt
#declare Sodium_Chloride_Salt_3_IOR = 1.500; // NaCl, tablesalt
#declare Sodiumbromide_IOR = 1.640; // NaBr
#declare Spessartine_IOR = 1.80; // Manganese Aluminum Silicate
#declare Sphalerite_IOR = (2.37 + 2.42) / 2; // Zinc Iron Sulfide
#declare Spinel_IOR = (1.71 + 1.76) / 2; // approximately, Magnesium Aluminum Oxide
#declare Spodumene_IOR = 1.66; // Lithium Aluminum Silicate, White, pink, green.
#declare Stishovite_IOR = 1.81; // approximately, Silicon Dioxide
#declare Strontiumdifluorid_IOR = 1.440; // SrF2
#declare Tanzanite_IOR = (1.68 + 1.72) / 2; // the gemstone variety of zoisite
#declare Tooth_structure_enamel_IOR = 1.655;
#declare Topaz_IOR = (1.61 + 1.64) / 2; // Aluminum Silicate Fluoride Hydroxide
#declare Tourmaline_1_IOR = (1.640 + 1.692) / 2; // Black, green, red, 
#declare Tourmaline_2_IOR = (1.620 + 1.657) / 2; // Indigo, polychrome.
#declare Tremolite_IOR = (1.60 + 1.63) / 2; // Calcium Magnesium Silicate Hydroxide
#declare Tridymite_IOR = 1.47; // approximately, Silicon Dioxide
#declare Tsavorite_IOR = (1.73 + 1.75) / 2; // a gemstone variety of grossular garnet
#declare Uvarovite_IOR = 1.86; // Calcium Chromium Silicate
#declare Vanadinite_IOR = 2.39; // Lead Chlorovanadate
#declare Wulfenite_IOR = (2.28 + 2.40) / 2; // Lead Molybdate
#declare Wurtzite_IOR = (2.36 + 2.38) / 2; // Zinc Iron Sulfide
#declare Zinc_oxide_IOR = 1.960; // ZnO. Also called zincite. Ionic crystal.
#declare Zinc_sulfide_IOR = 2.400; // ZnS. Common name is zinc blende. Ionic crystal having a beautiful redish yellow color.
#declare Zircon_IOR = (1.92 + 2.01) / 2; // Zirconium Silicate
#declare Zoisite_IOR = (1.68 + 1.72) / 2; // Calcium Aluminum Silicate Hydroxide


/////////////////////////////////////////////////
//                   LIQUIDS                   //
/////////////////////////////////////////////////
#declare Acetone_IOR = 1.360;
#declare Alcohol_IOR = 1.329;
#declare Asphalt_IOR = 1.635; // The hydro-carbon, not the road-asphalt :)
#declare Benzen_IOR = 1.500;
#declare Ethyl_Alcohol_IOR = 1.360;
#declare Flourite_IOR = 1.434;
#declare Sugar_Solution_30_IOR = 1.380; // 30% solution
#declare Sugar_Solution_80_IOR = 1.490; // 80% solution
#declare Water_20_C_IOR = 1.333; // 20 degrees Celsius
#declare Carbondisulfide_IOR = 1.630;
#declare Canada_balsam_IOR = 1.530; // Used as glue for optics.
#declare Glycerine_IOR = 1.473; // Provided by Sigmund Kyrre Aas <as@stud.ntnu.no>
#declare Terpentine_IOR = 1.427; // Provided by Sigmund Kyrre Aas <as@stud.ntnu.no>
#declare Carbon_tetrachloride_IOR = 1.460; // Provided by Sigmund Kyrre Aas <as@stud.ntnu.no>


/////////////////////////////////////////////////
//                   VARIOUS                   //
/////////////////////////////////////////////////
#declare Polystyrene_1_IOR = 1.550;  // Plastic. Value might be wrong, please use the second one
#declare Polystyrene_2_IOR = 1.490;  // Plastic. Provided by Sigmund Kyrre Aas <as@stud.ntnu.no>
#declare Gum_arabic_IOR = 1.480;  //
#declare Ivory_IOR = 1.539;  // ???
#declare Gelatin_IOR = 1.520;
#declare Aloe_IOR = 1.619;


/////////////////////////////////////////////////
//                 DISPERSION                  //
/////////////////////////////////////////////////
#declare Alexandrite_IOR_Dispersion = 1.745 / 1.757;
#declare Amber_2_IOR_Dispersion = 1.53 / 1.54;
#declare Amethyst_IOR_Dispersion = 1.544 / 1.55;
#declare Andalusite_IOR_Dispersion = 1.632 / 1.638; // Aluminum Silicate
#declare Andesine_IOR_Dispersion = 1.545 / 1.562; // Aluminum Silicate
#declare Anorthite_IOR_Dispersion = 1.575 / 1.591; // Calcium Aluminum Silicate
#declare Aquamarine_IOR_Dispersion = 1.57 / 1.60; // The blue gemstone variety of beryl
#declare Beryll_1_IOR_Dispersion = 1.568 / 1.602; //  The colorless variety, also known as Goshenite
#declare Beryll_2_IOR_Dispersion = 1.564 / 1.595; // The colorless variety, also known as Goshenite
#declare Brazilianite_IOR_Dispersion = 1.60 / 1.62; // Sodium Aluminum Phosphate Hydroxide
#declare Burbankite_IOR_Dispersion = 1.615 / 1.627; // Sodium Calcium Strontium Barium Cerium Carbonate
#declare Burbankite_IOR_Dispersion = 1.565 / 1.585; // Calcium Sodium Aluminum Silicate
#declare Calcite_IOR_Dispersion = 1.49 / 1.66; // Calcium Carbonate, CaCO3. Double refraction!
#declare Chalcedony_1_IOR_Dispersion = 1.539 / 1.544; // Calcium Sodium Aluminum Silicate
#declare Chalcedony_2_IOR_Dispersion = 1.526 / 1.535; // Calcium Sodium Aluminum Silicate
#declare Citrine_IOR_Dispersion = 1.544 / 1.553; // The yellow variety of quartz
#declare Cordierite_IOR_Dispersion = 1.52 / 1.57; // Magnesium Aluminum Silicate
#declare Dioptase_IOR_Dispersion = 1.65 / 1.71; // CuSiO3-H2O, Hydrated copper silicate
#declare Emerald_IOR_Dispersion = 1.57 / 1.60; // The green gemstone variety of beryl, Be3Al2Si6O18
#declare Goshenite_IOR_Dispersion = 1.57 / 1.60; // A gemstone variety of beryl, Colorless, Be3Al2Si6O18
#declare Granat_IOR_Dispersion = 1.705 / 1.805;
#declare Heliodor_IOR_Dispersion = 1.57 / 1.60;
#declare Hessonite_IOR_Dispersion = 1.73 / 1.75;
#declare Hypersthene_IOR_Dispersion = 1.69 / 1.77;
#declare Iolite_IOR_Dispersion = 1.52 / 1.57;
#declare Labradorite_IOR_Dispersion = 1.55 / 1.75;
#declare Lazurite_IOR_Dispersion = 1.495 / 1.501;
#declare Moissanite_IOR_Dispersion = 2.6 / 2.7;
#declare Morganite_IOR_Dispersion = 1.57 / 1.60;
#declare Narsarsukite_1_IOR_Dispersion_Dispersion = 1.601 / 1.614;
#declare Narsarsukite_2_IOR_Dispersion = 1.632 / 1.647; // Sodium Titanium Iron Silicate Fluoride
#declare Oligoclase_IOR_Dispersion = 1.533 / 1.552;
#declare Olivine_IOR_Dispersion = 1.64 / 1.70;
#declare Opal_IOR_Dispersion = 1.40 / 1.46;
#declare Peridot_IOR_Dispersion = 1.630 / 1.695;
#declare Quartz_IOR_Dispersion = 1.544 / 1.553;
#declare Quartz_Milky_IOR_Dispersion = Quartz_IOR_Dispersion;
#declare Quartz_Rose_IOR_Dispersion = Quartz_IOR_Dispersion;
#declare Quartz_Smoky_IOR_Dispersion = Quartz_IOR_Dispersion;
#declare Rhodonit_1_IOR_Dispersion = 1.723 / 1.732;
#declare Rhodonit_2_IOR_Dispersion = 1.716 / 1.741;
#declare Rhodonit_3_IOR_Dispersion = 1.711 / 1.738;
#declare Rock_Crystal_IOR_Dispersion = Quartz_IOR_Dispersion;
#declare Ruby_IOR_Dispersion = 1.76 / 1.78;
#declare Sapphire_IOR_Dispersion = 1.76 / 1.78;
#declare Scapolite_IOR_Dispersion = 1.54 / 1.60;
#declare Silicon_Oxide_1_IOR_Dispersion = Quartz_IOR_Dispersion;
#declare Sphalerite_IOR_Dispersion = 2.37 / 2.42;
#declare Spinel_IOR_Dispersion = 1.71 / 1.76;
#declare Tanzanite_IOR_Dispersion = 1.68 / 1.72;
#declare Topaz_IOR_Dispersion = 1.61 / 1.64;
#declare Tourmaline_1_IOR_Dispersion = 1.640 / 1.692;
#declare Tourmaline_2_IOR_Dispersion = 1.620 / 1.657;
#declare Tremolite_IOR_Dispersion = 1.60 / 1.63;
#declare Tsavorite_IOR_Dispersion = 1.73 / 1.75;
#declare Wulfenite_IOR_Dispersion = 2.28 / 2.40;
#declare Wurtzite_IOR_Dispersion = 2.36 / 2.38;
#declare Zircon_IOR_Dispersion = 1.92 / 2.01;
#declare Zoisite_IOR_Dispersion = 1.68 / 1.72;