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Uniaxial Minerals sorted by Index of Refraction |
( Bold - Valid Mineral Name)
(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name)
(# - Grandfathered as valid)
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Mineral Name | A | B | Sign | Bire | Pleo- chroic |
Dispersion |
Mcgovernite # | 1.757 ω | 1.76 ε | U+ | .0030 | No | |
Benitoite # | 1.757 ω | 1.804 ε | U+ | .0470 | No | |
Harrisonite ! | 1.759 ε | 1.77 ω | U- | .0110 | Yes | |
Theophrastite | 1.759 to 1.76 ω | 1.759 to 1.76 ε | U+ | .0000 | No | |
Corundum # | 1.76 ε | 1.768 ω | U- | .0080 | No | none |
Kapellasite ! | 1.76 ε | 1.8 ω | U- | .0400 | Yes | |
Mallestigite ! | 1.76 ω | 1.801 ε | U+ | .0410 | Yes | |
Hydroxylbastnasite-(Ce) | 1.76 ω | 1.87 ε | U+ | .1100 | No | |
Cappelenite-(Y) # | 1.76 | U | No | |||
Molybdophyllite # | 1.761 ε | 1.815 ω | U- | .0540 | No | |
Fresnoite | 1.765 ε | 1.775 ω | U- | .0100 | Yes | |
Henritermierite | 1.765 ω | 1.8 ε | U+ | .0350 | No | |
Stillwellite-(Ce) # | 1.765 to 1.784 ω | 1.78 to 1.787 ε | U+ | .0150 | No | |
Dorallcharite | 1.768 ε | 1.822 ω | U- | .0540 | No | |
Cyrilovite # | 1.769 ε | 1.803 ω | U- | .0340 | No | |
Swedenborgite # | 1.77 ε | 1.772 ω | U- | .0020 | Yes | |
Britholite-(Ce) # | 1.77 ε-ω | 1.81 ε-ω | U-+ | .0400 | Yes | |
Nabokoite | 1.773 ε | 1.778 ω | U- | .0050 | No | |
Atlasovite | 1.776 ε | 1.783 ω | U- | .0070 | No | |
Claringbullite | 1.78 ε | 1.782 ω | U- | .0020 | No | |
Manganarsite | 1.78 ε | 1.81 ω | U- | .0300 | No | |
Nanlingite | 1.78 ε | 1.82 ω | U- | .0400 | No | |
Sitinakite | 1.78 ω | 1.988 ε | U+ | .2080 | No | |
Thorite # | 1.78 to 1.82 ε | 1.79 to 1.84 ω | U- | .0100 to .0200 | Yes | none |
Plumbojarosite # | 1.783 ε | 1.878 ω | U- | .0950 | Yes | none |
Chernovite-(Y) | 1.783 ω | 1.879 ε | U+ | .0960 | Yes | |
Argentojarosite # | 1.785 ε | 1.882 ω | U- | .0970 | No | |
Fluorbritholite-(Ce) | 1.786 ε | 1.792 ω | U- | .0060 | Yes | |
Szymanskiite | 1.786 ε | 1.795 ω | U- | .0090 | Yes | |
Ashburtonite | 1.786 ω | 1.8 ε | U+ | .0140 | No | |
Turtmannite ! | 1.787 ε | ω | U- | No | ||
Painite # | 1.787 to 1.789 ε | 1.815 to 1.816 ω | U- | .0280 | Yes | |
Philipsbornite | 1.79 ε-ω | 1.79 ε-ω | U-+ | .0000 | No | |
Ferrotaaffeite-6N3S | ε | 1.79 ω | U- | Yes | ||
Sabelliite ! | 1.797 ε | 1.802 ω | U- | .0050 | No | |
Martyite ! | 1.797 ω | 1.806 ε | U+ | .0090 | Yes | |
Stishovite | 1.799 ω | 1.826 ε | U+ | .0270 | No | |
Kinichilite | 1.8 ω | 1.8 ε | U+ | .0000 | Yes | |
Ferronigerite-2N1S # | 1.8 ω | 1.81 ε | U+ | .0100 | Yes | |
Kleberite * | 1.8 to 2 | U | No | |||
Magnesionigerite-2N1S | 1.802 ω | 1.814 ε | U+ | .0120 | No | |
Magnesionigerite-6N6S ! | 1.802 ω | 1.814 ε | U+ | .0120 | No | |
Magnesiohogbomite-6N6S # | 1.803 ε | 1.853 ω | U- | .0500 | Yes | |
Magnesiohogbomite-2N3S | 1.803 ε | 1.853 ω | U- | .0500 | Yes | |
Magnesiohogbomite-2N2S | 1.803 to 1.823 ε | 1.848 to 1.853 ω | U- | .0450 | Yes | |
Kraisslite | ω | 1.805 ε | U+ | No | ||
Cerite-(Ce) # | 1.806 to 1.81 ω | 1.81 to 1.82 ε | U+ | .0040 to .0100 | No | |
Cerite-(La) ! | 1.81 ω | 1.82 ε | U+ | .0100 | Yes | |
Zairite | 1.81 ε | 1.82 to 1.83 ω | U- | .0100 to .0200 | No | |
Gaudefroyite | 1.81 ω | 2.02 ε | U+ | .2100 | Yes | |
Aluminocerite-(Ce) ! | 1.81 to 1.816 ω | 1.812 to 1.822 ε | U+ | .0020 to .0060 | Yes | |
Chromatite | 1.81 to 1.85 ω | 1.84 to 1.88 ε | U+ | .0300 | No | |
Yecoraite | 1.812 ω | 1.824 ε | U+ | .0120 | No | |
Hyttsjoite ! | 1.815 ε | 1.845 ω | U- | .0300 | Yes | |
Holfertite ! | 1.815 ω | 1.91 ε | U+ | .0950 | Yes | |
Herbertsmithite ! | 1.817 ε | 1.825 ω | U- | .0080 | Yes | |
Springcreekite ! | 1.817 ε | 1.858 ω | U- | .0410 | Yes | |
Hydroniumjarosite | 1.82 ε | 1.82 ω | U- | .0000 | No | |
Bismite # | 1.82 ε | 2 ω | U- | .1800 | No | |
Ferrohogbomite-2N2S ! | 1.827 ε | 1.852 ω | U- | .0250 | Yes | |
Beaverite # | 1.83 ε | 1.85 ω | U- | .0200 | No | |
Asbecasite | 1.83 ε | 1.86 ω | U- | .0300 | No | |
Zincohogbomite-2N2S ! | 1.832 ε | 1.878 ω | U- | .0460 | Yes | |
Jeanbandyite | 1.833 ε | 1.837 ω | U- | .0040 | No | |
Percleveite-(Ce) ! | 1.84 ω | 1.846 ε | U+ | .0060 | No | |
Paratacamite # | 1.843 ω | 1.848 ε | U+ | .0050 | Yes | |
Dussertite # | 1.85 ε | 1.87 ω | U- | .0200 | No | |
Zemannite | 1.85 ω | 1.93 ε | U+ | .0800 | Yes | |
Diaboleite # | 1.85 ε | 1.98 ω | U- | .1300 | Yes | |
Keystoneite | 1.85 ω | 1.99 ε | U+ | .1400 | No | |
Franciscanite-VIII | 1.856 to 1.859 ω | 1.876 to 1.882 ε | U+ | .0200 to .0230 | Yes | |
Orebroite-VIII | 1.857 ω | 1.875 ε | U+ | .0180 | No | |
Orebroite-III | 1.857 ω | 1.875 ε | U+ | .0180 | No | |
Franciscanite-III | 1.859 ω | 1.876 ε | U+ | .0170 | No | |
Bystromite # | 1.86 to 1.91 | U | No | |||
Benauite ! | 1.862 ε | 1.872 ω | U- | .0100 | No | |
Welinite-III | 1.864 ω | 1.88 ε | U+ | .0160 | No | |
Welinite-VIII | 1.864 ω | 1.88 ε | U+ | .0160 | No | |
Paraniite-(Y) | 1.87 ω | 1.92 ε | U+ | .0500 | No | |
Morelandite | 1.88 ω | 1.884 ε | U+ | .0040 | No | |
Denningite | 1.89 ω | 2 ε | U+ | .1100 | No | |
Wakefieldite-(La) ! | 1.9 ω | 1.9 ε | U+ | .0000 | Yes | |
Trippkeite # | 1.9 ω | 2.12 ε | U+ | .2200 | No | |
Laurelite | 1.903 ω | 1.946 ε | U+ | .0430 | No | |
Ganomalite # | 1.91 ω | 1.945 ε | U+ | .0350 | No | |
Daubreeite # | 1.91 ε | 2.15 ω | U- | .2400 | No | |
Bismoclite # | 1.91 ε | 2.15 ω | U- | .2400 | No | |
Ingersonite | 1.91 to 1.92 ε | 1.93 ω | U- | .0200 | No | |
Burnsite ! | 1.912 ε | 1.92 ω | U- | .0080 | Yes | |
Nasonite # | 1.913 to 1.945 ω | 1.923 to 1.971 ε | U+ | .0100 to .0260 | No | |
Scheelite # | 1.918 to 1.92 ω | 1.934 to 1.937 ε | U+ | .0160 to .0170 | No | none |
Rosiaite ! | 1.92 ε | 2.092 ω | U- | .1720 | No | |
Zircon # | 1.92 to 1.96 ε | 1.967 to 2.015 ω | U- | .0470 to .0550 | Yes | none |
Cumengite # | 1.926 ε | 2.041 ω | U- | .1150 | No | |
Phosphohedyphane ! | 1.928 ε | 1.935 ω | U- | .0070 | No | |
Belkovite ! | 1.928 ω | 2.002 ε | U+ | .0740 | No | |
Corkite # | 1.93 ε | 1.93 ω | U- | .0000 | No | |
Hafnon | 1.93 to 1.97 ω | 1.98 to 2.03 ε | U+ | .0500 to .0600 | No | |
Graphite # | ε | 1.93 to 2.07 ω | U- | No | ||
Kintoreite | 1.935 ε | 1.935 to 1.955 ω | U- | .0000 | Yes |