Refractive Index Mineral Birefringence
from various sources no guarantee from various sources
     
1.500 Lazurite 0.000
1.500 - 1.520 Bikitaite 0.013
1.500 - 1.610 Lapis Lazuli 0.000
1.502 - 1.519 Petalite 0.012
1.504 - 1.545 Ussingite 0.039 - 0.041
1.508 - 1.511 Leucite 0.001
1.508 - 1.717 Magnesite 0.191
1.509 - 1.525 Scolecite 0.008 - 0.010
1.510 - 1.530 Mellite 0.028
1.510 - 1.532 Poudretteite 0.016 - 0.021
1.512 - 1.522 Leifite 0.010 - 0.011
1.517 - 1.521 Carletonite 0.004
1.517 - 1.525 Pollucite 0.000
1.518 - 1.526 Moonstone 0.007 - 0.008
1.518 - 1.553 Orthoclase 0.005 - 0.012
1.518 - 1.561 Wavellite 0.025 - 0.026
1.520 - 1.680 Ammolite 0.135 - 0.145
1.522 - 1.530 Amazonite 0.008
1.522 - 1.537 Sanidine 0.005 - 0.008
1.522 - 1.578 Cordierite / Iolite 0.005 - 0.017
1.525 Adularia 0.005 - 0.008
1.525 Albite 0.008 - 0.010
1.525 - 1.536 Peristerite 0.008 - 0.010
1.525 - 1.587 Lepidolite 0.029 - 0.038
1.527 - 1.549 Kovdorskite 0.022
1.528 - 1.531 Shomiokite-(Y) 0.003
1.528 - 1.551 Andesine 0.009 - 0.010
1.529 - 1.551 Milarite 0.003
1.529 - 1.677 Witherite 0.148
1.530 - 1.540 Agate 0.004
1.530 - 1.540 Chrysoprase 0.004
1.530 - 1.540 Prasiolite 0.009
1.530 - 1.550 Marialite 0.005 - 0.009
1.530 - 1.685 Aragonite 0.156
1.531 - 1.570 Shortite 0.039
1.533 - 1.552 Oligoclase 0.003 - 0.05
1.534 - 1.540 Tiger's eye 0.009
1.535 - 1.537 Apophyllite 0.002
1.535 - 1.540 Carnelian 0.009
1.539 - 1.545 Amber 0.000
1.540 Jasper 0.009
1.540 - 1.579 Scapolite 0.004 - 0.038
1.542 - 1.551 Cavansite 0.009 - 0.012
1.543 - 1.551 Andesine 0.008 - 0.009
1.543 - 1.554  Amethyst 0.009
1.543 - 1.554  Citrine 0.009
1.543 - 1.554 Quartz 0.009
1.544 - 1.549 Chkalovite 0.005
1.544 - 1.563 Aventurine 0.009
1.545 - 1.560 Charoite 0.007 - 0.009
1.550 - 1.600 Meionite 0.034 - 0.040
1.552 - 1.561 Beryllonite 0.009
1.553 - 1.628 Hambergite 0.072 - 0.074
1.555 - 1.573 Bowenite ?
1.560 - 1.570 Goergeyite 0.024
1.560 - 1.572  Labradorite 0.005 - 0.010
1.560 - 1.572  Oregon Sunstone 0.007 - 0.009
1.560 - 1.580 Brucite 0.020
1.560 - 1.605  Emerald 0.005 - 0.009
1.562 - 1.602  Beryl 0.004 - 0.007
1.563 - 1.59 Norbergite 0.026 - 0.027
1.564 - 1.596 Aquamarine 0.005 - 0.008
1.564 - 1.602  Red Beryl 0.004 - 0.007
1.564 - 1.660  Chalcedony 0.009
1.566 - 1.579 Heliodor 0.004 - 0.007
1.566 - 1.602 Goshenite 0.004 - 0.008
1.570 - 1.590 Augelite 0.014
1.570 - 1.614 Anhydrite 0.042 - 0.044
1.570 - 1.620 Montebrasite 0.020 - 0.050
1.571 - 1.599 Clinochlore 0.005 - 0.011
1.575 - 1.584 Nifontovite 0.009
1.577 - 1.583  Morganite 0.004 - 0.008
1.578 - 1.612 Amblygonite 0.020 - 0.027
1.578 - 1.840 Rhodochrosite 0.218 - 0.220
1.582 - 1.584 Zektzerite 0.002
1.582 - 1.639 Catapleiite 0.036
1.583 - 1.595 Xonotlite 0.012
1.583 - 1.639 Grandidierite 0.037
1.586 - 1.614 Colemanite 0.028
1.587 - 1.597 Bultfonteinite 0.010
1.587 - 1.627 Herderite 0.029 - 0.030
1.590 - 1.596 Ekanite 0.012
1.591 - 1.633 Eudialyte 0.003 - 0.004
1.592 - 1.646 Chondrodite 0.027 - 0.032
1.594 - 1.621 Phosphophyllite 0.021
1.595 - 1.645 Larimar 0.028 - 0.038
1.595 - 1.645 Pectolite 0.028 - 0.038
1.599 - 1.637 Tremolite 0.017 - 0.028