{"material":"Vacuum","group":"General","wavelength_nm":null,"refractive_index":1,"refractive_index_min":1,"refractive_index_max":1,"as_listed":"1 (by definition)","remark":null}
{"material":"Helium","group":"Gases at 0 °C and 1 atm","wavelength_nm":"589.29","refractive_index":1.000036,"refractive_index_min":1.000036,"refractive_index_max":1.000036,"as_listed":"1.000036","remark":null}
{"material":"Hydrogen","group":"Gases at 0 °C and 1 atm","wavelength_nm":"589.29","refractive_index":1.000132,"refractive_index_min":1.000132,"refractive_index_max":1.000132,"as_listed":"1.000132","remark":null}
{"material":"Air at STP","group":"General","wavelength_nm":null,"refractive_index":1.000273,"refractive_index_min":1.000273,"refractive_index_max":1.000273,"as_listed":"1.000273","remark":null}
{"material":"Air","group":"Gases at 0 °C and 1 atm","wavelength_nm":"589.29","refractive_index":1.000293,"refractive_index_min":1.000293,"refractive_index_max":1.000293,"as_listed":"1.000293","remark":null}
{"material":"Carbon dioxide","group":"Gases at 0 °C and 1 atm","wavelength_nm":"589.29","refractive_index":1.00045,"refractive_index_min":1.00045,"refractive_index_max":1.00045,"as_listed":"1.00045","remark":null}
{"material":"Liquid helium","group":"Other materials","wavelength_nm":null,"refractive_index":1.025,"refractive_index_min":1.025,"refractive_index_max":1.025,"as_listed":"1.025","remark":null}
{"material":"Perfluorohexane (Fluorinert FC-72)","group":"Other materials","wavelength_nm":null,"refractive_index":1.251,"refractive_index_min":1.251,"refractive_index_max":1.251,"as_listed":"1.251","remark":null}
{"material":"Water ice","group":"Other materials","wavelength_nm":null,"refractive_index":1.31,"refractive_index_min":1.31,"refractive_index_max":1.31,"as_listed":"1.31","remark":null}
{"material":"TFE/PDD (Teflon AF)","group":"Other materials","wavelength_nm":null,"refractive_index":1.315,"refractive_index_min":1.315,"refractive_index_max":1.315,"as_listed":"1.315","remark":null}
{"material":"Water","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.333,"refractive_index_min":1.333,"refractive_index_max":1.333,"as_listed":"1.333","remark":null}
{"material":"Intestinal mucosa (human)","group":"Other materials","wavelength_nm":"964","refractive_index":1.3335,"refractive_index_min":1.329,"refractive_index_max":1.338,"as_listed":"1.329–1.338","remark":null}
{"material":"Cryolite","group":"Other materials","wavelength_nm":null,"refractive_index":1.338,"refractive_index_min":1.338,"refractive_index_max":1.338,"as_listed":"1.338","remark":null}
{"material":"Cytop","group":"Other materials","wavelength_nm":null,"refractive_index":1.34,"refractive_index_min":1.34,"refractive_index_max":1.34,"as_listed":"1.34","remark":null}
{"material":"10% glucose solution in water","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.3477,"refractive_index_min":1.3477,"refractive_index_max":1.3477,"as_listed":"1.3477","remark":null}
{"material":"Acetone","group":"Liquids at 20 °C","wavelength_nm":null,"refractive_index":1.36,"refractive_index_min":1.36,"refractive_index_max":1.36,"as_listed":"1.36","remark":null}
{"material":"Ethanol (ethyl alcohol)","group":"Liquids at 20 °C","wavelength_nm":"590.29","refractive_index":1.361,"refractive_index_min":1.361,"refractive_index_max":1.361,"as_listed":"1.361","remark":null}
{"material":"20% glucose solution in water","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.3635,"refractive_index_min":1.3635,"refractive_index_max":1.3635,"as_listed":"1.3635","remark":null}
{"material":"Polytetrafluoroethylene (Teflon)","group":"Other materials","wavelength_nm":null,"refractive_index":1.365,"refractive_index_min":1.35,"refractive_index_max":1.38,"as_listed":"1.35–1.38","remark":null}
{"material":"Liver (human)","group":"Other materials","wavelength_nm":"964","refractive_index":1.369,"refractive_index_min":1.369,"refractive_index_max":1.369,"as_listed":"1.369","remark":null}
{"material":"Sugar solution, 25%","group":"Other materials","wavelength_nm":null,"refractive_index":1.3723,"refractive_index_min":1.3723,"refractive_index_max":1.3723,"as_listed":"1.3723","remark":null}
{"material":"Cornea (human)","group":"Other materials","wavelength_nm":null,"refractive_index":1.387,"refractive_index_min":1.373,"refractive_index_max":1.401,"as_listed":"1.373/1.380/1.401","remark":null}
{"material":"Lens (human)","group":"Other materials","wavelength_nm":null,"refractive_index":1.396,"refractive_index_min":1.386,"refractive_index_max":1.406,"as_listed":"1.386–1.406","remark":null}
{"material":"Silicone oil (nD25)","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.398,"refractive_index_min":1.393,"refractive_index_max":1.403,"as_listed":"1.393–1.403","remark":null}
{"material":"Ethylene tetrafluoroethylene (ETFE)","group":"Other materials","wavelength_nm":null,"refractive_index":1.403,"refractive_index_min":1.403,"refractive_index_max":1.403,"as_listed":"1.403","remark":null}
{"material":"Sylgard 184 (polydimethylsiloxane)","group":"Other materials","wavelength_nm":null,"refractive_index":1.4118,"refractive_index_min":1.4118,"refractive_index_max":1.4118,"as_listed":"1.4118","remark":null}
{"material":"Sugar solution, 50%","group":"Other materials","wavelength_nm":null,"refractive_index":1.42,"refractive_index_min":1.42,"refractive_index_max":1.42,"as_listed":"1.4200","remark":null}
{"material":"60% glucose solution in water","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.4394,"refractive_index_min":1.4394,"refractive_index_max":1.4394,"as_listed":"1.4394","remark":null}
{"material":"Kerosene","group":"Liquids at 20 °C","wavelength_nm":null,"refractive_index":1.44,"refractive_index_min":1.44,"refractive_index_max":1.44,"as_listed":"1.44","remark":null}
{"material":"Fused silica (a pure form of glass, also called fused quartz)","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":1.458,"refractive_index_min":1.458,"refractive_index_max":1.458,"as_listed":"1.458","remark":null}
{"material":"Polylactic acid","group":"Other materials","wavelength_nm":null,"refractive_index":1.46,"refractive_index_min":1.46,"refractive_index_max":1.46,"as_listed":"1.46","remark":null}
{"material":"Carbon tetrachloride","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.461,"refractive_index_min":1.461,"refractive_index_max":1.461,"as_listed":"1.461","remark":null}
{"material":"Pyrex (a borosilicate glass)","group":"Other materials","wavelength_nm":null,"refractive_index":1.47,"refractive_index_min":1.47,"refractive_index_max":1.47,"as_listed":"1.470","remark":null}
{"material":"Vegetable oil","group":"Other materials","wavelength_nm":null,"refractive_index":1.47,"refractive_index_min":1.47,"refractive_index_max":1.47,"as_listed":"1.47","remark":null}
{"material":"Glycerol","group":"Other materials","wavelength_nm":null,"refractive_index":1.4729,"refractive_index_min":1.4729,"refractive_index_max":1.4729,"as_listed":"1.4729","remark":null}
{"material":"Sugar solution, 75%","group":"Other materials","wavelength_nm":null,"refractive_index":1.4774,"refractive_index_min":1.4774,"refractive_index_max":1.4774,"as_listed":"1.4774","remark":null}
{"material":"Poly(methyl methacrylate) (PMMA)","group":"Other materials","wavelength_nm":null,"refractive_index":1.4896,"refractive_index_min":1.4893,"refractive_index_max":1.4899,"as_listed":"1.4893–1.4899","remark":null}
{"material":"Benzene","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.501,"refractive_index_min":1.501,"refractive_index_max":1.501,"as_listed":"1.501","remark":null}
{"material":"Halite (rock salt)","group":"Other materials","wavelength_nm":null,"refractive_index":1.516,"refractive_index_min":1.516,"refractive_index_max":1.516,"as_listed":"1.516","remark":null}
{"material":"Plate glass (window glass)","group":"Other materials","wavelength_nm":null,"refractive_index":1.52,"refractive_index_min":1.52,"refractive_index_max":1.52,"as_listed":"1.52","remark":null}
{"material":"Crown glass (pure)","group":"Other materials","wavelength_nm":null,"refractive_index":1.52,"refractive_index_min":1.5,"refractive_index_max":1.54,"as_listed":"1.50–1.54","remark":null}
{"material":"Sodium chloride","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":1.544,"refractive_index_min":1.544,"refractive_index_max":1.544,"as_listed":"1.544","remark":null}
{"material":"Amber","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":1.55,"refractive_index_min":1.55,"refractive_index_max":1.55,"as_listed":"1.55","remark":null}
{"material":"PETg","group":"Other materials","wavelength_nm":null,"refractive_index":1.57,"refractive_index_min":1.57,"refractive_index_max":1.57,"as_listed":"1.57","remark":null}
{"material":"Polyethylene terephthalate (PET)","group":"Other materials","wavelength_nm":null,"refractive_index":1.575,"refractive_index_min":1.575,"refractive_index_max":1.575,"as_listed":"1.5750","remark":null}
{"material":"Polycarbonate","group":"Other materials","wavelength_nm":"150","refractive_index":1.6,"refractive_index_min":1.6,"refractive_index_max":1.6,"as_listed":"1.60","remark":null}
{"material":"Flint glass (pure)","group":"Other materials","wavelength_nm":null,"refractive_index":1.61,"refractive_index_min":1.6,"refractive_index_max":1.62,"as_listed":"1.60–1.62","remark":null}
{"material":"Crown glass (impure)","group":"Other materials","wavelength_nm":null,"refractive_index":1.62,"refractive_index_min":1.485,"refractive_index_max":1.755,"as_listed":"1.485–1.755","remark":null}
{"material":"Carbon disulfide","group":"Liquids at 20 °C","wavelength_nm":"589.29","refractive_index":1.628,"refractive_index_min":1.628,"refractive_index_max":1.628,"as_listed":"1.628","remark":null}
{"material":"Bromine","group":"Other materials","wavelength_nm":null,"refractive_index":1.661,"refractive_index_min":1.661,"refractive_index_max":1.661,"as_listed":"1.661","remark":null}
{"material":"Flint glass (impure)","group":"Other materials","wavelength_nm":null,"refractive_index":1.724,"refractive_index_min":1.523,"refractive_index_max":1.925,"as_listed":"1.523–1.925","remark":null}
{"material":"Sapphire","group":"Other materials","wavelength_nm":null,"refractive_index":1.77,"refractive_index_min":1.762,"refractive_index_max":1.778,"as_listed":"1.762–1.778","remark":null}
{"material":"Arsenic trisulfide and sulfur in methylene iodide","group":"Liquids at 20 °C","wavelength_nm":null,"refractive_index":1.9,"refractive_index_min":1.9,"refractive_index_max":1.9,"as_listed":"1.9","remark":null}
{"material":"Boron nitride","group":"Other materials","wavelength_nm":null,"refractive_index":2.07,"refractive_index_min":2,"refractive_index_max":2.14,"as_listed":"2–2.14","remark":null}
{"material":"Tantalum pentoxide","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":2.15,"refractive_index_min":2.15,"refractive_index_max":2.15,"as_listed":"2.15","remark":null}
{"material":"Cubic zirconia","group":"Other materials","wavelength_nm":null,"refractive_index":2.165,"refractive_index_min":2.15,"refractive_index_max":2.18,"as_listed":"2.15–2.18","remark":null}
{"material":"Potassium niobate (KNbO3)","group":"Other materials","wavelength_nm":null,"refractive_index":2.28,"refractive_index_min":2.28,"refractive_index_max":2.28,"as_listed":"2.28","remark":null}
{"material":"Zinc oxide","group":"Other materials","wavelength_nm":"390","refractive_index":2.4,"refractive_index_min":2.4,"refractive_index_max":2.4,"as_listed":"2.4","remark":null}
{"material":"Strontium titanate","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":2.41,"refractive_index_min":2.41,"refractive_index_max":2.41,"as_listed":"2.41","remark":null}
{"material":"Diamond","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":2.417,"refractive_index_min":2.417,"refractive_index_max":2.417,"as_listed":"2.417","remark":null}
{"material":"Titanium dioxide (rutile phase)","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":2.614,"refractive_index_min":2.614,"refractive_index_max":2.614,"as_listed":"2.614","remark":null}
{"material":"Silicon carbide (moissanite; 6H form)","group":"Solids at room temperature","wavelength_nm":"589.29","refractive_index":2.65,"refractive_index_min":2.65,"refractive_index_max":2.65,"as_listed":"2.65","remark":null}
{"material":"Cinnabar (mercury sulfide)","group":"Other materials","wavelength_nm":null,"refractive_index":3.02,"refractive_index_min":3.02,"refractive_index_max":3.02,"as_listed":"3.02","remark":"Birefringent: nω = 2.905 nε = 3.256"}
{"material":"Silicon","group":"Other materials","wavelength_nm":"1200–8500","refractive_index":3.45,"refractive_index_min":3.42,"refractive_index_max":3.48,"as_listed":"3.42–3.48","remark":null}
{"material":"Gallium(III) phosphide","group":"Other materials","wavelength_nm":null,"refractive_index":3.5,"refractive_index_min":3.5,"refractive_index_max":3.5,"as_listed":"3.5","remark":null}
{"material":"Gallium(III) arsenide","group":"Other materials","wavelength_nm":null,"refractive_index":3.927,"refractive_index_min":3.927,"refractive_index_max":3.927,"as_listed":"3.927","remark":null}
{"material":"Germanium","group":"Other materials","wavelength_nm":"3000–16000","refractive_index":4.075,"refractive_index_min":4.05,"refractive_index_max":4.1,"as_listed":"4.05–4.1","remark":null}