Mineral	Refractive Index	Birefringence
no guarantee	from various sources	from various sources
Actinolite	1.614 - 1.655	0.023 - 0.027
Adularia	1.525	0.005 - 0.008
Agate	1.530 - 1.540	0.004
Albite	1.525	0.008 - 0.010
Alexandrite	1.745 - 1.759	0.008 - 0.010
Allanite	1.640 - 1.828	0.013 - 0.026
Almandine	1.760 - 1.830	0.000
Amazonite	1.522 - 1.530	0.008
Amber	1.539 - 1.545	0.000
Amblygonite	1.578 - 1.612	0.020 - 0.027
Amethyst	1.543 - 1.554	0.009
Ammolite	1.520 - 1.680	0.135 - 0.145
Analcime	1.479 - 1.493	0.001 - 0.002
Anatase	2.488 - 2.564	0.073
Andalusite	1.627 - 1.650	0.008 - 0.010
Andesine	1.543 - 1.551	0.008 - 0.009
Andradite	1.860 - 1.950	0.000
Anglesite	1.878 - 1.895	0.017
Anhydrite	1.570 - 1.614	0.042 - 0.044
Apatite	1.628 - 1.650	0.003 - 0.007
Apophyllite	1.535 - 1.537	0.002
Aquamarine	1.564 - 1.596	0.005 - 0.008
Aragonite	1.530 - 1.685	0.156
Augelite	1.570 - 1.590	0.014
Austinite	1.750 - 1.780	0.024
Aventurine	1.544 - 1.563	0.009
Axinite	1.672 - 1.704	0.010 - 0.012
Azurite	1.720 - 1.848	0.108 - 0.110
Baddeleyite	2.130 - 2.200	0.070
Bahianite	1.810 - 1.920	0.110
Barite	1.636 - 1.648	0.110 - 0.120
Bastnaesite	1.717 - 1.818	0.101
Bazzite	1.607 - 1.628	0.021
Benitoite	1.757 - 1.804	0.046 - 0.047
Beryl	1.562 - 1.602	0.004 - 0.007
Beryllonite	1.552 - 1.561	0.009
Bikitaite	1.500 - 1.520	0.013
Bixbyite	2.510 - 2.560	0.000
Boleite	2.030 - 2.050	0.000
Boracite	1.658 - 1.673	0.010 - 0.011
Bowenite	1.555 - 1.573	?
Brazilianite	1.603 - 1.623	0.019 - 0.021
Bromellite	1.719 - 1.733	0.028
Brookite	2.583 - 2.700	0.122 - 0.157
Brucite	1.560 - 1.580	0.020
Bultfonteinite	1.587 - 1.597	0.010
Bustamite	1.662 - 1.707	0.013 - 0.018